0: https://www.rabobank.nl/particulieren/beleggen/rabo-beheerd-...
It is also just very hard in practice. A lot of people have their mortgages, savings that are locked for years, etc. at a bank. Also, switching a bank also impacts other family members if you have shared accounts, etc.
In this particular case it's also not fully clear yet whether Wero is starting to enforce this. If that happens to be the case, it's only a matter of time before other banks also start requiring Play Integrity for Wero transactions.