I can't speak for how Carvana operates today, but when I bought my car years ago the loan was subcontracted through some unrelated financial provider (Go Financial, now Bridgecrest). I remember being kind of annoyed at this; that I wasn't just signing in to Carvana's website to pay. But, its fine.

I think Carvana did make mistakes; but I also think the industry as a whole is very deeply suffering right now. And we only hear about Carvana because they're a VC SV darling.