Still can be a crapshoot. I was grumbling several years ago to a friend that a variety that had done really well for me was off the market. I then got an excited email from a friend of the friend who said she’d found it on Amazon and ordered several packets so she could give it to me. I replied that the seed was off the market because the supplier had quit breeding it several years previously, it was a hybrid so nobody else would be breeding it on their own (except to try to breed it out into an open-pollinated and then you rename it, it’s not the same thing), and so the seed was either very old seed which from that species wasn’t going to grow or was mislabeled seed of some other variety. They were able to cancel the order in time not to be charged; but it simply hadn’t occured to them that a random seller on Amazon, with no presence elsewhere as a seed company, might be selling old seed or mislabeled seed.
If you buy a piece of clothing or an electronic gizmo or whatever online and it’s a piece of junk or misrepresented, you’ve lost your money. If you buy living material from a bad source and go ahead and plant it, you may not only lose your money but screw up the production ability of your field and/or a much wider ecosystem. Not worth the chance.