They didn't. What happened is that one of them (Johnny) was a staunch conservative, so, like Sex Pistols with Johnny Rotten, they are routinely "cancelled" from the punk scene (e.g. they are not real punk, their music sucks etc). Other bands with less musical prowess (like the Exploited) are still idolatred by the punk scene because they were largely anarchists. It's fun that, after 50 years, Ramones and SP are the only punk bands that still generate controversy. Pretty much all the others are run-of-the mill punk bands that we got used to and completely lost any provocative charge.

Johnny Rotten voted for Trump in 2020.

(What? He did. I don't like it either. Well, I thought it was funny.)