According to Rimu Atkinson, the main developer of PieFed, all PieFed instances come with a 3000-long block list of resources that cannot be linked to. These include all sorts of right-wing outlets. There is no easy opt-out, forcing existing instances to follow the blocklist.
I support blocking propaganda and fascism, however this is just censorship imo. This could be a good feature, IF the ultimate choice is on the instances and its users on if they want to have it enabled or not by default, not from the developer and "on all instances with no easy opt-out"
I'd say that block in general is a bit much, this can be nice if it can be used as a similar feature to "hide bot posts", so users have the choice on if they want to hide or show those posts with the blocked link in them. Meanwhile each instances can decide what the default is, on or off, but the end user can decide how they want