Going through the process when someone else signs up using your email is also not a walk in the park, even though they have "not your account?" link at the bott

Going through the process when someone else signs up using your email is also not a walk in the park, even though they have "not your account?" link at the bottom of their Welcome email. This happened to me at different times on FB and IG, and it was such a drawn-out hassle that I just went the other route, signing in with my own email, saying I forgot password, getting a new one, then deleting accounts that way.