I'm reasonably certain they have all been hacked recently, and they don't take security seriously, because: Why bother? They'll never face any serious consequences, and their power will continue unchecked.
I mean, this is exactly how it feels these days, and it sorta does feel like the entry field for my information on those sites isn't that safe lol. Let alone professional, makes you wonder if the sites legitimate. 🥴
Credit bureaus are certainly evil but modern life in the US still forces us to work with them, so you may as well register free online credentials with them all so you can check the records they have on you for accuracy. They actually do respond quite consistently fast. I once had a LendingClub thing listed in my history when I've never touched anything involving the company, and whichever-bureau-it-was (I can't remember any more) promptly removed it upon my informing them.