Comment by saurik

I don't understand the "why" behind the second paragraph. (In contrast, you explain the tech more for the third paragraph.) To do a callback to the first paragraph, this is very unlike email: my email server barely has a working spam filter and explicitly will never actively reject email (or just organizes and tags it differently), and yet I am able to send and receive email from large hosts (or at least could until I lost my ancient IP address due to my colo provider moving to a different state, for which I weep; but that is an entirely unrelated issue, afaik ;P), as who else I email is none of their business. What about the tech of Mastadon makes other nodes refuse to "federate with" me if I "federate with" something they don't like?