[imbokodo]

You are correct. Their about page says "We oppose all forms of prejudice, authoritarianism and vanguardism".

Opposing authoritarianism is implicitly saying they are not communist, saying they are against vanguardism (a word used by Lenin) means they are explicitly saying they are not communist.

Also as their web page says, they are not really a group with an ideology. They are a bunch of left-leaning techs who provide mailing lists, web site service etc. for left-leaning groups who "believe it is vital that essential communication infrastructure be controlled by movement organizations and not corporations".

My guess for what happened - the police were looking for one person or group that uses Riseup. As so many progressive organizations use Riseup, the targeting of one user or group of the service became a targeting of five locations, of people who provide the technological infrastructure of much of the left in Germany.

[mdekkers]

"we oppose all forms of oppression blah blah". I find they stop being interested in your oppression as soon as your views differ from theirs.

[lainga]

>explicitly saying they are not communist

Just explicitly not Marxist-Leninist. I thought there were plenty of communists who made up with anarchists after balking at Lenin and the Comintern's demands in the 1920s.