Lasse Collin (the developer of xz-utils) has found out how to accept donations without breaking the Finnish money collection law:
https://github.com/tukaani-project/xz/issues/105#issuecomment-2599004098
He has created an account on #LiberaPay with a restriction to not accept donations from Finns or people living in Finland:
https://liberapay.com/Larhzu/