I left because of how reddit treated the 3rd part app Devs, suddenly forcing them to cancel subscriptions halfway through the year. (They could have given the Devs a heads up, but chose not to.) I left because of the libel that was being spread about a dev. For me, it wasn’t that they wanted to charge money to use reddit, it’s how they went about it that made me leave and not return.
Of course, they also forgot about blind people and moderating tools. They then kicked many mods for voicing their opinion and/or participating the blackout, even if the subreddit in question was in agreement with them.
I don’t see Sync doing any of that, so please speak for yourself on why the migration happened.