I'm assuming that you're referring to the Lemmy developers. FHF supports Lemmy development with a monthly donation of €50, same as we do for Mastodon development.

If it makes you feel better, there are enough other people donating who don't mind some or all of their donation amount going towards Lemmy development to offset your donation not being used for Lemmy development contributions.

It's not worth the effort to set up independent purpose-bound donation pools to separate donations from people unwilling to support certain people/organizations, as the end result would be the same, except a lot more maintenance/accounting overhead. Calculating with the current expenses of €1,700/month, this is less than 3% of the total donations we'd need to cover our bills.