This seems similar to the Notepad++ team using their platform to promote political viewpoints.
The same thing happened with Facebook "pages", when they became a personal "soap box" by the owner of the page. It was downhill from there... You might as well turn the whole web into FB/Twitter/X/Insta promotional spam at that point.
It's not at all similar, and that doesn't have anything to do with the quality or lack thereof of the viewpoints.
The Notepad++ site is run by the authors and reflects their stance. Putty.org is run by an outside party who hijacks the reputation of the PuTTY project to push their agenda.