Anyone that politically aligns with them. They say that explicitly:

> We support individuals, collectives, communities and groups whose political and social activities fit within this worldview and who share with us some fundamental principles: anti-fascism, anti-racism, anti-sexism, anti-militarism

They don't receive any money for this. It's 100% volunteer services.

Then they are an activist group, not an “infrastructure provider” as claimed elsewhere in this thread, and holding them responsible for what their members do with the accounts they give them seems entirely fair.