Burner and ben are two common words, almost 100% sure it is just coincidence. Also if you're making an psuedo email you probably shouldn't use the alias you go by; I recommend using a random string generator.

An another note, Protonmail doesn't let you use the standard recaptcha verification if it sees you are on a vpn or tor node so you either have to use your actual IP, verify with phone, verify with non-proton email, or make a donation. Proton claims that they don't log phone or email but it's up to you if you trust these claims.

If you're ultra-paranoid , I suggest getting a prepaid visa using cash and then signing up to Protonmail over tor and spend five dollars to verify your account (I believe the money goes towards one of the subscription plans they have, it doesn't just go to the void). Make sure to also use a long randomized password and change it often :3