I have a theory that being a too-many-tabs person correlates strongly with how many captchas you see. So if you have 300 tabs open, and then you need to restart your browser and recover your tabs, your computer is hitting a whole bunch of cloudflare (or whatever centralized captcha org) sites at once which raises suspicions. And orgs like cloudflare probably track IP address reputations, almost like blacklists.

Is this on track? Is there anything out on the 'net that might back this up? Or debunk it?

@thomasafine Nah. I use OneTab, save my tabs regularly and frequently clear browsing history.

What seems to trigger captchas and Cloudflare checks the most: my VPN.

@raynetoday It's happening to me at a static IP address that is not a VPN, and is in fact assigned to a very large university, and has been the address of my system for literally decades. So I'm looking for other explanations, and right now the vast number of tabs I currently have open is the leading explanation.
@thomasafine Wonder if the uni IP address *is* the problem. I don't think it's hard to believe that unis are on moderation lists given the current climate, and moreso if uni addresses are seen as a likely source of cyber attacks.