

The same way Spam emails work. Spit shit everywhere and get that 0.000000001% return click, but it costs you almost nothing to put it out.
The account gets history with actual posts, and if it survives without being banned for spam, will eventually be cleared of posts and sold as an established account.
It’s entirely likely. That site hasn’t changed a bit in over 2 decades. .
While publicly known external security vulnerabilities may have been found and patched over the years, having the source leaked means a look behind the hood at new weaknesses and a field day with exploiting them.
If 4Chan does come back, I think it will look significantly different.