Steam Store will accept anything that's not 'illegal' or 'trolling'
 

In efforts to police content on Steam, Valve suddenly changed its policy in mid-May and cracked down on on certain visual novels, giving them a week or two to change their content or be removed from the store. The resulting backlash from confused dev...

https://www.engadget.com/2018/06/06/...l-or-trolling/