I dont know where did you get the information that we are somehow for activist exlcusive. Nowhere on our website, neither in our Mission statement we say anything about it. The images on the website (which is I believe the clue here) is somewhat resembling our political ideas (of those behind disroot) and are commentary to what we believe are similar "disrooting" struggles in real life, where poeple take matters in their own hands, creating active opposition to the powers to be and alternative ways of thinking. As long as poeple are civil, and respectful towards eachother, even if on different political spectrums, they are all welcome. I think our TOS defines the terms well.
Of course what we do here, no matter if disroot, riseup, dismail or any other librehosters is in fact political and social activism and a very radical one considering the current status quo and monopolization of internet services.
As for your question asking for other platforms, have a look at https://libreho.st its a network of fair-service providers which we are also part of.