I think now is a great time to remind everyone, like sync's developer, Lemmy's developers need to be paid too! The amount of time all the devs put into making lemmy exist, in my opinion, should be worth some of your money. If you can afford it, donating to the people who develop lemmy and/or the people keeping your home instance up will accelerate the incredible growth of lemmy!
Is it true that purchases from sync for reddit don't carry over to sync for lemmy? I don't know how anyone could possibly justify a lifetime purchase if so.
They literally are making a new app that, sure, has a very similar look and feel but its for a completely different platform. Sure, it probably shares UI code, but I'm sure a lot of the code to pull from reddit had to be scrapped. I think they deserve to be compensated for their effort and giving any one the app just because they paid for a different app woyls not be compensarion for their efforts. They have to get paid so they can live just like you and me.
When you buy something you do not have to think whether the developer deserves it or not, especially for software where producing more copies is free. You decide whether it is worth it for you.
When you donate, you think about whether someone deserves it and who deserves your money most.