I feel that all Mastodon Administrators should have an option to place a non-intrusive (rotating) banner on their instance.
As in this case, it can be used to make users aware that funding is welcome for stability.
But I can also imagine that it is a way to attract some income from other parties. If their users do not like it, then those users can move to another instance that does not do that.
I would think positively about parties that support my instance.