It’s weird how upset people are getting over memes about sync. It’s a shame because the memes are pretty funny.
None of the FOSS advocates actually care that you use Sync unless they’re going to your house and uninstalling it when your not looking.
And there’s a lot of misconceptions about free software. Free Software is opposed to proprietary software, not paid software. All projects, whether free or proprietary require compensation of some kind, or else they wouldn’t exist.
There is a legitimate debate around if proprietary software is ethical. The whole existence of the free software movement is because the proponents of it saw proprietary software as unethical.