If this can happen, is it possible that once mandatory developer verification comes into effect, all 3rd party apps will be uninstalled at first and require a re-install?

Concerning this specific case, NFCGate is a tool on which malware (family) titled NGate by ESET is based, thus likely causing a false positive.

Oh, and no bypass is available anymore (aside from disabling play protect):

  • skuzz@discuss.tchncs.de
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    1 month ago

    If you read the alleged protection dialog, Google’s only blocks against 2G networks. The same of which many carriers allow, enable, or enforce blocking, and if not *#*#info#*#* let’s you do it yourself.

    “2G network protection - Avoids 2G networks, which are less secure”