Filtering isn’t censorship, knots nodes still validates every block, they just choose not to relay junk. Bitcoin has had filtering since Satoshi’s time; dust limits and non-standard script relay rules were there from the start.

Knots runners are happy to validate payments and have zero interest in censoring transactions. Its the sharing and storing of child porn and other non financial data many of us don't want to participate in. But hey if you like kiddie porn you can just run Core