There should be something similar to haveibeenpwned, maybe haveibeensold, where you can report these things and see if others are experiencing the same. If ube

There should be something similar to haveibeenpwned, maybe haveibeensold, where you can report these things and see if others are experiencing the same. If uber sold the email addresses, or had a leak, many people will be affected, and some of them likely have custom aliases. If nobody else was affected, it might just be a random event, bots try to brute-force aliases on domains all the time.