Earlier quoted context omitted.
> Even though people have been interested in donating, I can't do that legally. What you can do is to "sell" something in lieu of donations: E.g. - To support me please buy this wallpaper image file of my project logo. Or one-day email support etc. You can always add a note that Finland laws prevent you from accepting donation, and this is the only way you can accept money from patrons, and even provide a link to the…
Sure and this is kind of what I do. I have a sole proprietorship and sell stickers and in the future some minor features on the site. Of course it has the overhead of setting up the business and all the accounting/tax stuff (unless you use a service for that which takes ~5 % of your revenue).
[*] Digital artwork = project logo in png format, free to use however they please. You can license the publicly-available logo with any minimally-restrictive license (e.g. CC-BY); this should still count that "you gave them additional rights, in exchange for payment".