I've been getting that offer for years (admittedly I don't know if it always required 15k or if it was previously smaller like 10k or something), though it did stop getting offered for a little while either last year or in 2021 I think.
The recent offer I got that really caught my attention was from Wells Fargo though. It was to open a premier checking account and get $2,500. The catch was that you had to deposit 250k into the account. I'm not exactly sure who that offer is for, because no one just has 250k lying around to put into a bank account, and if you do there's probably way better ways to invest it. Unfortunately I threw out the offer, but I found a link by googling it. Maybe someone more financially literate than me can tell me if I'm an idiot in reading it or if it's as

as I think it is.
Wells Fargo is offering a significant bonus of $2,500 for customers who open or upgrade to a Wells Fargo Premier relationship. To qualify for the bonus,
www.yourbankguy.com