Sadly churches are filled with people and people are fallible. The larger the church the more likely problems occur visibly.

The archetype of the 10x engineer is called “Brent”

In France the law does not allow rent (or mortgage) payments higher than 1/3 of net monthly income.

It is pretty effective at keeping the housing market vaguely in check.

Fell apart after COVID when a bunch of Parisians sold their little apartments and arrived in the provinces with a million in their pocket. The law has kept it level after that big jump though I think.