tbh, there is no such instance. Not blocking any other instances is often a reason to be blocked by other instances.
An instance that blocks no one is in effect a "free" speech instance that prioritises the right to be bigoted over the need to provide safe spaces for folk. And that means that instances that value the need for safe spaces over "free" speech are going to block the instances that don't block anyone else as a means of creating and maintaining that safe space.