It's cool to hate it, for a lot of people who moved to fediverse early, it's a matter of FOSS software and an ideology. Everyone has a flexing point in their ideology, early adopters of fediverse can't be flexible at closed source products. I personally draw my flexing boundary at large capitalist companies. Sync is developed by one guy and tbh with a way pretty UI than any of the FOSS software has (my personal opinion) so I like it. And I use it. But I understand the ideological point of FOSS everything, but I don't understand people who want FOSS everything but they contribute nothing.