Considering there was a whole hubbub starting from late Aug 2025 RE: Certification of ALL Android apps/.apks: https://android-developers.googleblog.com/2025/08/elevating-...

Followed by a partial walk-back from Google in mid Nov 2025: https://android-developers.googleblog.com/2025/11/android-de...

I would say there is a substantial amount of users willing to install off-play Store .APKs. Substantial enough they're also willing to take a 'jump' and accept the risks/errors displayed