I heard about Vero ( https://www.vero.co/ https://www.vero.co/ ) the other day. Their business model is to allow the first wave of users to join for free, then

I heard about Vero ( https://www.vero.co/ https://www.vero.co/ ) the other day. Their business model is to allow the first wave of users to join for free, then later charge a subscription to new users. I don't know whether they'll be a contender in the long run, but they've experienced rapid growth recently (unfortunately leading to service scaling issues).