Fortunately even without any preferential peering it only takes a few percent of nodes to form a complete graph.

Long ago Gilmore wrote "The Net interprets censorship as damage and routes around it."  This statement was more aspirational than technically true,  but in Bitcoin we not only met that criteria but exceed it.  Bitcoin takes advantage of the nature of information being easy to spread but hard to stifle.

Idiots are free to run censorware, -- free to ignore the patiently argued points about their censorship being pointless and counterproductive.   Bitcoin will continue to interpert censorship whatever the motivation as damage and route around it.  And as the desperately failing censors up their malicious attacks, defensive countermeasures will be deployed as required.