I might be that poster.
In my case it was a come-on from a furniture store. Apply for our instant-approval store credit card, use it to pay for whatever furniture you buy today, and the promotional deal is:
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Zero percent APR for 35 months as long as you make at least the minimum payment on time for each of the 35 months.
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Pay the entire remaining balance in full no later than the 36th month on time.
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If it any time you fail to do 1 or 2, the entire balance is subject to 35% APR computed retroactively from the day of the purchase.
So their goal is to issue the card to people who buy things they can’t actually afford, then the instant they miss a payment by a day, whether due to inattention or due to cash flow, the trap is sprung and now whatever the furniture cost, the poor folks will be paying ~100% on top of that as interest to the issuing bank. Ka-ching for the bank. Of course some folks will indeed handle the minimum payments just fine but when the balloon is finally due they have no hope of paying that. Same outcome. 35% APR retroactive interest for however many years and now they owe their soul to the company furniture store.
Plus of course once you have the card from ABC furniture, they’ll keep emailing you come-ons about sales for more furniture you didn’t know you needed. At least some of which will trigger purchases the store would not otherwise have captured.
Conversely, for me, who will promptly set up autopay for the minimum payment amount, set it to pay a few days early so I can check their website to ensure they got it with enough time left to the due date to make an alternate payment if needed, and who has no cashflow problem paying off the balance at any time, it’s a not quite one-way bet for free money.
On that day I opened an instant account like that at a furniture store, a separate one at a mattress store with a 12-month 0-percent-then-bear-trap-at-39%, and used an existing card like that I already had at an electronics store for another 0% for 24 months deal.
So I walked out of those stores with orders to completely furnish an otherwise bare 1bedroom apartment with all snazzy stuff having spent $0 out of pocket, expecting about $100/mo in combined monthly payments and then between one and 3 years from now needing to pony up the other $30K to pay off the three cards. And still pay no interest while my $30K is invested the whole time. I’ll probably make $5-7K on this deal. Which is a nice discount on my furniture.
But the critical thing as it applies to the OP’s goals is the zero-percent offer only applies to purchases at the store using the store’s captive card. If you don’t want furniture or a mattress or a TV you’re stuck. There’s no way to just get cash under their deal.
That doesn’t work with a conventional card, even a very low-rate one for people with great credit. The cash advance feature of your card tends to have a 2% or more recently 5% fee attached immediately. And isn’t available at a zero percent rate. Sometimes there are low promotional rates, but the 5% upfront fee is the real killer for any hoped-for investment use of the resulting cash.
There was a time 15+ years ago where folks with superb credit did have deals like that. Cash advances with no upfront fee and 1% APR on the cash advance balance. Hell, you could stroke $10K (or $50K) on your credit card(s), buy US savings bonds with the proceeds, and as long as you never missed a payment have a guaranteed 4% or whatever rate of return on a riskless straddle. I knew folks with $150K or $200K of various banks’ money in flight in schemes like that. All totally legal and totally legit nder the terms of the banks’ agreements. I tried it myself a couple times, but back in the days before reliable autopay, writing and mailing checks was too much admin hassle for the risk. I’d totally do it now if the banks would still offer the deal.
But if you missed one payment on one of these not-quite-kites, you’d negate 3, 4, or maybe even 5 other deals by suddenly being subject to the horrendous normal credit card borrowing interest rate. Of 15, 20, or even 25%. Reckoned retroactively back to when you took out the advance. So even immediately paying off that card from other assets doesn’t undo the damage of any mistake you make.