Personally, I wasn't too worried by the pricing model of Sync, and I'm usually tight AF - I think post- the great 3rd party client purge of Reddit it's clear to me just how much value they brought to my browsing experience, so I'm happy to support the developers.

I think people who say these apps already exist and it's just a case of porting to the Lemmy APIs are massively underestimating the actual amount of work involved to do these apps justice on Lemmy. £20 or so to support the developer and gain an ad-free experience seems entirely fair to me!