That's kinda true in that most communities on here are much smaller than those on Reddit. With that being said, community isn't individuals, and in instances where a community of similar size exists, one large group of people likely doesn't differ in opinion to another.

One benefit people should hopefully see from third-party apps moving to Lemmy/Fediverse is more people willing to contribute to those communities. It's one of the reasons why I don't give a fuck who creates an interface.

Similarly, competition in FOSS is never a bad thing. If a paid, closed-source app is doing something better, then it's on the FOSS alternatives to step up their game and learn from each other.