I opened a Coinbase account back in college ~6 years ago when they were giving $10 in Bitcoin to anyone who signed up with a .edu email address. I forgot about it until last summer, when I realized that amount was now worth around $160.
I didn't have access to my college email anymore, so having to provide proof of identity was reasonable; having the entire process take a month wasn't. They also do this particularly insidious thing where if they don't respond to your request for two weeks or so, they automatically close it as unresolved. They do automatically reopen it if you send another email, but that you have to do that in the first place is dumb.