I'm used to getting assaulted by Cloudflare's browser check interstitials along with random Cloudflare and Google CAPTCHAs because (presumably) I run Firefox and an ad-blocker instead of vanilla Google Chrome. It's already tremendously inconvenient to wait multiple seconds on many page loads and click 20 bicycles, I can only imagine how infuriating it would be if every page load started taking 60 seconds because your IP ended up on some random algorithmic blacklist....
I use firefox and an ad blocker and I don't see these CAPTCHAs ( except for a few rare instances that I can recall). Something else must be going on to get you flagged.