[Userscript] NSFW games filter

1 & 2) Script get game info from Steam API and checks Developer/Publisher of the game and content descriptors. It does not check age restrictions because most of cheap NSFW games have this field = 0.
On the Steam game page you can scroll down to the section "Mature Content Description", if this section exists → game have some content descriptors (but Steam does not show them, you can only see description text from developer). Exact content descriptors can be checked on the SteamDB (in the AppInfo section).
Mostly filtering based on those descriptors.
I added blocklist and whitelist just for blocking developers/publishers who didn't set those descriptors for their games, and to prevent blocking games from normal developers/publishers.
Atm blocklist is empty and whitelist have only 2 publishers :) But I created suggestion discussions on GitHub to allow ppl suggest developers/publishers for blocklist and whitelist.

3) May be later, but I will keep that in mind.

4) Nope. Script queries SteamAPI and caching results, but after last update (today) I cleared my cache before testing it xD So now I have only ~100 game AppIDs in the cache.

can we suggest games to be added as i know some where the publishers/devs also make non adult games

I created suggestions discussion on GitHub

Atm whitelist and blocklist are inside a script code.
User can open script source code and add publishers/developers to those lists (minimal JavaScript knowledge is required I guess).
Also I created discussions on GitHub where people can suggest publishers/developers for whitelist and blocklist. Those publishers/developers will be added to script code (shared lists).

Tags in Steam are divided into 2 cotegories:
1) Tags by developer - you can see those tags on the Steam game page under achievements list, to the right of the extended game description. For example:

Title: A Plague Tale: Requiem
Genre: Action, Adventure
Developer: Asobo Studio
Publisher: Focus Entertainment

2) User defined tags - you can see those tags at the top section of the page to the right of the screenshots list.
For example:

Popular user-defined tags for this product:
Adventure Action Action-Adventure Exploration +

Steam API allows to retrieve only developer' tags, usual there are only 2-3 tags. But it still possible to get them and filter games by those tags. This feature was present in ESGST (I didn't used ESGST for few months so I don't know if it still has that feature).