If the subreddits that I am usually lurking on have migrated here then I'll have no problem with staying on Lemmy. And if there's a mobile app (preferably on Android) for browsing Lemmy (and the fediverse in general) then even more reason for me to stay here.
But for a definitive answer? Yes
I know you probably have seen a lot of answers from others already and my answer would probably be the same as others (for obvious reasons) but I am going to answer anyway because you told me not to lurk. Please note that I am not an expert (or even somebody who knows much about business) so don't expect my answers to even be half correct.
If by profitable you mean "not making a loss" then probably yes as long as if there are enough donations to cover the expense of running the server.
But if by profitable you mean "making enough money to be sustainable long term" then my answer would be most likely not because it's not designed to make money (unlike ahem...certain platform)