As of today, these questions have nowhere else around StackExchange to be a good fit. Being the case (I believe) there's a considerable amount of PMs here who also deal with such problems, would it be the interest of the community to also consider such questions on-topic?
Edit: Interesting enough, some questions (like THIS) are clearly about how to deal with vendors at company level and still on-topic.
Worth to highlight I'm NOT proposing to repurpose pm.se. I want to hear from the community if covering this area is something that could be acceptable to only then, IF there's engagement and community believes there's a LOT of overlapping, to discuss with SE team.