“Causing a slow during a bull run” cannot be reasonably called censorship, anymore than outbidding someone at an auction is “censoring” them from buying the painting (or whatever). There can be considerations about the way to deal with tons of arbitrary data being shoved into the chain, and basically filtering by node policy probably wouldn’t be a bad idea, could slightly raise fees necessary for JPEGS and NFTS to get into blocks over honest bitcoin transactions. 

(funny, something like ocean mining and stratum v2 use would be optimal for node policy having the largest impact)