A few months ago I was unnecessarily banned on my reddit account first, but then even if I use different computers and a different Internet, it somehow realizes that it’s me and bans me. When I open my account, there is no problem, but as soon as I write something, it is banned.
I’m no expert but I assume advertisers (or someone) has a fingerprint of you for each browser, so like if you log into your Google account on your mobile browser, you’re obviously the same person who logs into that YouTube account on your desktop browser.