Dutch consumers don't want, can't be bothered, or have such loyalty to their bank of choice, that even a criminally-low rate won't convince them to switch bank
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.
It's not hard to just move your savings. A lot of people do that actually; just keep the standard banking account for daily payments and all other services, and put savings in bank-managed ETFs, time deposits, or savings accounts with other banks (I do all three).
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