Idealistically and realistically: Totally and absolutely cool. If anything, they have a moral imperative to keep the project going, since there are users that depend on it, and doing that requires money. As such, people will need to be informed of how to contribute, so a pop up doing just that is a good way to achieve this. Why would this not be ok, even idealistically?
I’d put my money on that account being hacked/sold and gaining a new life as a bot in some disinformation network ready to spew bias and bullshit when the time and topic is right. There’s no other way to explain the comment history before 9 months ago, then a long silence, and then a restart just a few weeks ago with a complete change in character.