Even having a Gmail address doesn't make you immune from someone putting in the wrong address.

I made a throwaway/spam account with a silly name back in ~2007, and then in ~2015 someone established a fairly successful company with that name. I now regularly get job applications, tax documents, and employee timesheets to my email. They even signed up for the service that controls their website with my email.

I keep waiting for them to contact me about taking over the address, but as far as I can tell they don't even realize they don't control it.