Fun fact: at some point I wrote @param in a PR comment, talking about a parameter's doc. I only realized after posting that there was an actual user named @param.
I am @3x and I get ~10 notifications a day of people mentioning me in PRs and issues. Whenever anyone writes the name of a file containing `@3x`, which is commonly used for hi-res assets, I get a notification. I quickly learned to turn off email notifications!
I had to turn off my paypal.me because I naively picked a number for a username and people kept putting that number in the send-to-username field and sent me free money, which they always tried to refund later, getting me stuck dealing with PayPal's customer service through no fault of mine. I would explain to them that I didn't ask for the money, I do not want to keep the money, and I am not accusing the sender of scamming. Sometimes I was able to refund instantly but depending on the sender and payment method, PayPal had to get involved for weeks of back and forth.