With the flagging of another site (turnout.app) by Google Safe Browsing, I have detected a pattern that occurs in those flags (unsure if it’s been mentioned before): login/signup pages as an index page.
Websites which have a login page as their index are almost immediately flagged by Google Safe Browsing; nearly every case I have seen reported on this forum is a site that had a login page as its index. I’m not sure if Google does this for all sites like this, or if they only flag sites ran on free hosting (because they might be considered easy targets for spammers, who usually set up deceptive sites with login pages as an index to serve totallyfacebook.notascam.tld as iframes or similar methods).