This happened to me with EndJunk and it was absolutely devastating trying to recover and reset the email address on all of my accounts. Some were straight-up locked out after too many failed password attempts and required email access on the original email address (which I no longer had access to as EndJunk had gone silently under), so I just lost those. Some let me change email addrs if I remembered the password, others required verification at the original and new addr, which again was impossible as EndJunk was just gone.

I guess I got what I paid for.