Having said that, I think a presumed-innocent approach would be better - so the spammers would get in, but almost immediately shut down - and legitimate new members would not be inconvenienced.
And really, how much faster would that disappear these threads than reporting it does, and is the transient appearance of this spam so irritating that much more needs be done?
Right, that’s where you have to start considering the return on the energy invested. Spam sucks, but spam here gets dealt with very quickly on the whole, and as a result I don’t think the posts that get through and disappear - often in a few minutes, sometimes a few hours overnight - are a big negative on the user experience. Stopping newbies from posting would be a bigger negative since it would likely keep some people from joining the board. As things are, I think the spam is a bigger inconvenience to the mods, and while we’d love to reduce that inconvenience, I don’t think we want to do it by shifting it to users.
Do we have that many regular dopers from India?
How about not having the ability to post hyperlinks as a new member until after a certain post threshold? Or do they space out their links so this couldn’t happen?
Certainly loading it on brand new members would be counterproductive, but a cohort of willing, responsible volunteers from within the membership could ease some of the mod inconvenience, leaving them better resourced to handle the more nuanced work.
There’s also always something to be said for the “kill-'em-all-let-god-sort-'em-out” approach.
We have just enough posters and readers to prevent nuking you guys from orbit. 
WE’ve been over this in multiple threads. Not a viable option.
They’ll spam us about something else next week, but I’ll be sort of glad when this boxing match is in the rear view mirror.
Apologies for my countrymen, but they’re just the symptom innit? I’m guessing it’s being outsourced like a lot of other grunt work. Some of the tech enabled solutions to slow down new posters from India sound like a good idea, except that besides being the source of spam, India also happens to have a relatively massive (untapped) demographic that the Dope could benefit from. It’s a potential market. The junior modding idea sounds like a good one. Ask for volunteers, and get in a bunch of spam busters. Add a multiple choice “Reason for reporting” and all the spam that’s reported could even go only to them, while everything else comes to the regular mods.