Not all parties are equal.

There's lots of names that might have bee fine 18 years ago, but maybe not now. Alternatively getting away for something for 18 years doesn't mean anything except you got away with it for 18 years. And sure it's possible moderation was applied in correctly. Take it up with support if you're convinced moderation was misapplied.

Although I would avoid the petulant "meanwhile, Steam does X" to justify your name. Pointing out "hypocrisy" may not be the slam dunk argument you think it is.

引用自 SMOOTH CRIMINAL：

Meanwhile Steam sells pdf PRN on their front page of the store page, real hypocritical and creepy steam

There’s a filter you have to turn off to see explicit store content. There is no filter to hide your name which everyone sees.

Your account is 2 days old.

引用自 Nx Machina：

Your account is 2 days old.

https://psteamcommunity.yuanyoumao.com/discussions/forum/7/682986810375169731/

The difference between the porn games and your username, is that people can opt out of the porn games. Your old name isn't crossing the line for me I would have ignored it.

Porn games in the store, you can opt out of seeing.
Your profile name, you cannot opt out of seeing.

It has ALWAYS been a rule to keep your nickname appropriate. Even before porn games got added to Steam.

Steam also isn't unique with this rule either.
Many sites with public forums or even online games, having an inappropriate name would result in punishment.