I’ve been noticing a lot of ‘interesting’ behavior with data-hungry websites when I use more privacy-focused measures lately.
Gmail logs me out of Safari at least weekly now for no apparent reason, other than to inconvenience me.
Gmail also refuses to deliver any emails forwarded through hide my email. They simply do not arrive, not even to spam. I had to start using another email service for hide my email. (Additionally, every email I get from Apple gets tagged with a phishing warning, which is just petty and funny.)
Facebook sends an email every time I log in (once or twice a month) to tell me that Firefox is suspicious because I use ad-blockers and private windows.