I wish Signal would also sell something, anything, but sell it: t-shirts, plushies/pillows, paid sticker packs, a "PRO" logo next to your name in your contacts list (to satisfy your vanity), a fake "license" that marks you as a supporter (gpg key signature of your name or something like that).

This is a criticism I give to all FOSS projects trying to raise money, sell me stuff, it's easier to justify an expense than a donation, especially if I pay it through my company.