[chenxiaolong]

There shouldn't be any side effects other than rendering Play Protect inert. No other AOSP component relies on this setting.

[zozbot234]

There could of course be side effects in the future when this restriction is rolled out, as in your device's Play Integrity status could be affected and your banking app/phone wallet might not let you perform app-based payments from that device.

[ezconnect]

Some bank apps and payment processor already check if you have developer mode on and refuses to run.

[frandroid]

Oh so that's why my bank app said it thought my old device was rooted when it wasn't...