I did a poll and nearly 30% of the people who voted said they used Sync! It's stayed around that percent the whole time too!
EDIT: Here is the poll I forgot to put this here like five times lol https://strawpoll.com/wby5A21R1yA
That must be why I've never seen ads. I see people bitch about it every time someone mentions Sync, but have literally never seen one. Also the dev is a bad ass. I've twice mentioned bugs in release threads and he's fixed them within a few minutes each time.