restream.io I think you mean? I have an account there and I was looking into it only last week. Also, Streamlabs OBS now has multistream integrated in the most recent update. I haven't checked it out yet, but looks promising.
Biggest problem is that Twitch affiliate contract... Many ignore it and just do it anyway, but I wonder how long it takes for Twitch to start banning small streamers for that too.
Worst they'll do is revoke your affiliate account. They'll ignore you even when you ask to turn off your affiliate account.