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Over a quarter of Lemmy users use Sync (based on a poll)
(loot.buckodr.ink)
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
Yes, if I choose to stay on a specific version, I'll be stuck on that version.
But you have the same issue with FOSS apps if they change something I don't want. If you choose to stay on a specific version, you will also be stuck with potential security issues/missing regulatory changes and a lack of new features.