Perhaps I am biased, but I'd still like to point out some facts :)
Yes, it has ads. It also has options to remove them.
No, you can post. That's coming soon.
This app is also in its first beta release. It hasn't been officially launched yet. It just happened that a lot of people who were excited about Sync coming back drummed up a lot of hype for it when the beta finally launched, that we kicked off a massive news wave apparently.
Also, of the ones I've used, the fluidity of the app, the smoothness of it, and the polish (especially for a beta) is unmatched from the other Lemmy clients I've used (haven't used all of them, but I used a lot of them.)