I had Cloudflare block access to FlyerTalk for several months from my work network (US based). We have a single fixed IP address for Internet egress that's been the same for years, and there's only about 6 people in that office. Suddenly one day I was blocked. FT worked fine for me from everywhere else. I have no idea where my work IP address would get flagged like that. I find it unlikely that someone else in the office was doing anything malicious, but you never know.