Are there real documented cases of a company replacing their SaS with a vibe-coded version?

Like I can see how a very small company could replace a portion of an overkill and underutilized SaS platform.

I don’t see how a larger more complex business could replace their SAP or ADP with a vibecoded version.

These stories are all very similar in where the author knows some CEO of an obscure company who told them they had an engineer reverse engineer and vibecode some obscure SaS solution and saved them $50K.