I pay the server admins for feddit.uk (the instance this community is hosted on) to help with hosting costs because I think they provide a valuable service. Currently I am not paying towards Lemmy (I do pay towards Mastodon development however) but I may start doing that in the future.
My £5 a month to Feddit.uk and £1 a month to Mastodon isn’t much but it’s orders of magnitude more than Reddit and Twitter would have earned from my (adblock using) eyeballs before so hopefully a few of us paying a few pounds/euros/dollars directly is enough to support the services.
And on that note, consider donating to the instance and/or the Lemmy devs (and any other open-source project you find useful). I also need to make a round of donations soon!
Divide by zero (the instance I'm on) takes donations. People who donate get a nifty flair in the governance threads, but you don't have to donate to vote on issues the server faces. (We also allow non-members to vote, though since they're not as impacted by decisions made for the instance, their votes are given lower weights.)