Why do banks require "safety"net on their apps now? The safest roms specifically don't have the security nightmare that is google play services, and banking apps are always the hardest to get working.
It is a symbiotic relationship. Regulators hear about the next wave of compromised online banking, add some law requiring whatever, banks are stuck having to comply and in comes google with "Hey this great webDRM/safetynet/playprotect totally complies with this", which it doesn't really but google has the capabilities to lock up any legal processes about it for years when they bring in the next thing and repeat. Banks in large part know it's bullshit but don't care, they're off the hook (They are the ones doing 2 factor by making the banking app on your phone require a confirmation in your tan app on your phone to make a transaction, they don't give a rats ass about the safety of their systems).
Banks get someone shielding them from regulations for cheap, google gets partners that can help them lock you in their proprietary system, and you get extra work on your rooted phone and can't fully remove play services.