Think about things from the point of view of someone who has never used Reddit or the fediverse, but you've heard about them both from recent news articles and want to see what they are about.
Reddit:- You Google Reddit and your first result is Reddit.com. You click the link and are presented with the front page. You from scroll from a few hours and end up signing up and staying.
Lemmy:- You Google Lemmy and your first result is a wiki article for Lemmy Kilmister... Your second result might be join-lemmy.org, which you're smart enough to realise it's probably more likely what the news is about.
You click join-lemmy.org and are presented with a page of information about the fediverse, links to set up a server and pictures of code...
There is very little chance you're going to investigate further.
If we want the fediverse to replace Reddit then either
A) Lemmy needs to improve its initial impression and Search engine optimization
B) We should be promoting a different platform with a better initial first impression.
I'd recommend kbin personally as it gives the same sort of experience as Reddit from the initial interaction.
"No money" well, there can be some if you donate to https://www.buymeacoffee.com/kbin as per the About page at the bottom of the page.
Even with the donations I doubt there's that much of a profit to being made. Servers are expensive, and there's no way that servers are the only overhead that ernest is dealing with.
His own knowledge, skills, abilities, and time are almost certainly worth more than he is receiving in donations. Dudes a skilled programmer/developer and is putting serious work into this. If he was putting his time and effort into freelance work instead he'd be building a heck of a nest egg.