I'm sure Hey will .... email you wink a link to sign up for a paid account. If they link to the pricing page in the app, that's a no-no, but if they EMAIL it to you, and you just so happen to be using an email client that can display that link, then that's okay.
- download the app
- use the free service for 14 days
- see their emails disappear on day 14
Doesn't seem like a great xp. Wouldn't it be better to be told straight away "you need an account for this"?
Also, Schiller has now instigated a wonderful tool for trolling and harassment.