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One thing I thought it could be is I use PostHog for analytics / heat map recording, but I tried completely removing it and they still rejected it.

One of my site got flagged as a Compromised Site by Google. I used Posthog on that site as well!

Was it flagged as Compromised Site on Google Ads or actually blocked in Chrome (Google Safe Search)?

Blocked in Chrome.

It looks like you still have rrweb running. Have you tried removing that?

I've readded it since removing it entirely because I haven't got anywhere with Google