It seems there are plenty that don’t - although that may also be for practical reasons.
But yes, I do think that free software ideals discourage supporting those platforms - however some may support them to give their users at least some freedom, eg when they are forced to use the platforms due to some work policy.
But yes, I do think that free software ideals discourage supporting those platforms - however some may support them to give their users at least some freedom, eg when they are forced to use the platforms due to some work policy.