It seems to be the complete opposite in many respects. As with the 'contracture' that happened in 2016-18, Mastodon if it doesn't completely remove your instance, will suppress anything that doesn't fall into the neutered neoliberal worldview. Spend 10 minutes on any of the largely Federated instances and you will see some sort of partisan idiocy encouraging prejudice against others. It's not nearly as bad as BlueSky and their immense trouble with religious extremism and CSAM but is still pretty terrible in its own right.