It's because it prints money. Is just a straight money printing machine. Of all the Golden Goose's, it's best to just leave it alone and let it do it's thing.
Facebook prints money too but that didn’t stop them from turning the clean perfect interface they had in 2010 into the steaming pile of eggs it is now.
I mean, yeah, that was a huge mistake. They should have left it alone entirely, they would have had so much more money to build the Meta-verse with!
It's because Facebook has to constantly "innovate" to raise the share price. I'm sure Craigslist makes some decent income for it's owners and can pay it's bills every month but it's never going to explode in growth. They don't need new investors constantly because they don't do anything new. Their whole site is basically LAMP except for Perl instead of PHP. The latest part of their tech stack is a mail server that's 10 years old.
I think this is intentional. The more you scroll their ugly interface to find what you are looking for, the more ads you see.
Article says it has "10s" of employees. They are just maintaining the money printer.