Want to make a difference on climate change as a technologist? Feel free to join these communities actively looking for support and with ongoing projects (that are alive): - https://climateaction.tech/ - https://techimpactmakers.com/ - https://www.tmrow.com
The principle of HN is intellectual curiosity: https://news.ycombinator.com/newsguidelines.html. Repetition is the enemy of curiosity—readers come here for things they haven't seen before. So is promotion—readers come here for relief from growth marketing, not to be subjected to it. We want users to post to HN when their personal intellectual curiosity is engaged, and not otherwise.
Rallying support for a cause is no different, even if the cause is important—more important than the rest of what's on this site. In fact, that importance means that HN needs even more protection, because otherwise it would be taken over completely by those more important things.