To all the folks saying that reddit couldn't replace the mods, that it was too big an effort, that they couldn't run a big sub all by themselves, I have only one thing to say to you.
I'm sure users will step forward if they care. Otherwise, it's just a campaign optimization at work. Limit the breadth of organic content to deepen the brand-friendly content and push more paid media into the feed.
From the one time I tried requesting a sub there, they don't just let someone have a sub if they ask and it'd be banned otherwise, they probably won't give it to you if you don't have mod experience for example (the reason I didn't get the niche sub I was trying to revive, which is reasonable enough), or if they feel that what experience you do have isn't enough that you'd likely be able to handle the particular sub. TIHI is a big sub, so they'd not just be looking for any random volunteer, it'd have to be someone experienced with moderating sizable subs, probably. And those people are, well, exactly the kind of people angry with reddit right now.
Yes they most definitely will...but increasingly such things likely will not happen on the Reddit platform, moving forward. There are actual reasons that the mods left - e.g. to moderate a sub of millions of subscribers takes effort, which needs tools to make that happen - and those reasons still exist.