Wikipedia is able to pull that off because wikipedia is a digital encyclopedia, not a social forum to add comments to or respond at a massive scale like lemmy is or reddit was. A majority of services either get their revenue from ads, or they start off not doing that but eventually have to cave in and let ads in.

I think ads can be annoying sometimes, but if they’re done in a similar way reddit did them before their downfall, then it would be tolerable and at least give the lemmy.world admins enough money to cover server running costs