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
It was near the top of everything, or whatever we call /r/all over here, that's where I saw it. I think it was in a technology community, but not 100% sure.