Caporegime
BTL mortgages are, imo, the biggest problem with the rental markets & should never have been a thing. They're a ticking timebomb worthy of the 2008 bank crash.
Why do you say that? Honestly, anyones whos primary motivation is maximal money extraction from rental properties is likely to be a bit dodgy. I don't think there is anything fundamentally wrong with people owning multiple houses vs companies doing it.