Strong statements there!
I wrote based on my experience of using chirp.social, at least I found useful and easy to work with for a small group of friends, I have not faced spam over the last two months. Possible that if the service provider decided to discontinue the service can be a problem. Having tested the group features of kbin.social and friendica (venera.social), if I had to use one of them, I’d use #Friendica that I find more intuitive. The other alternative might be to use a common hashtag but #YMMV.