Server costs for large instances are a thing, and I think it’s a good idea to have an incentive for people to keep hosting them
Can leave it up to each instance how they want to monetise. A lot of instances have donations setup already, could get a “premium” account to help the upkeep of the instance you’re on and get rid of the ads
Also if people really hate them adblock exists
that’s the beauty of the lemmy - you can run your own instance full of ads. i wish you all the luck ;)