Fascinating! Still no issues here, going on a few days, with this setup:
1. LOS 17.1 + Stock GApps package.
2. Manual revokation of most permissions from Google App.
3. I'm NOT signed in to any Google accounts on the device. Thus, I'm using most apps ( Chrome, YouTube, and a bunch that I sideloaded: Netflix, etc) unauthenticated to Google.
Note that I had a pretty similar setup a couple weeks ago, although without proactively revoking permissions from GoogleApp, and that rebooted every few mins.
I have not checked on Developer Options, but will report back.