I know Stripe is a darling YC company but if you look for it, you can find some usually anonymous detractors.
"+1. Also a founder of an $XB fintech. Exact same story. Patrick + John dangled an acquisition to get a look inside, and ended up re-trading on the terms. Then proceeded to target 2 of our team members to recruit. Fast forward a few years, and now they have deployed a team to directly copy one of our products. Amongst their L2 team, Patrick and Will are described as the "killers". I guess maybe a bit of duplicity is required to build a company of that size..."