Tankie is a pejorative label generally applied to authoritarian communists, especially those who support acts of repression by such regimes or their allies. More specifically, the term has been applied to those who express support for one-party Marxist–Leninist socialist republics, whether contemporary or historical.
As long as the developers don't force their political views on people using the software I really don't see an issue.
You could argue they aren't doing it today but what about tomorrow?
Well I would say everything is open source. If something does change that you don't agree with you can just take the code and build your own. (Obviously with blackjack and hookers)