Key words or phrases that make you instantly click "hide giveaway"

DLC giveaway (for already owned DLC and Soundtrack DLC)
1k+ Achievements on thumbnail

VR
Visual novel
Hidden object
MMORPG

Exceptions may happen, but generally:
VR
Sports
Racing
MMO(RPG)
Multiplayer Only
Moba/Arena shooter (usually multiplayer only as well)
Competitive
The FPS/TPS crafting-building-zombies-withsurvival bars, literally anything from those
RPGMaker - I read the descriptions but 90+% that it's a generic hero-saves-world cliché-heap
Shmups
Tower Defense (I burnt out on them, and still have 2-3 great ones to play if I'd like to)
Nudity / adult content in VNs or anime games are .... eh. The obsessive fanservice in almost any anime games more often is a turnoff than not for me.
Otome/dating sim

In order:

• Anime
• Nudity
• Sexual Content
• Otome
• Cute (I always expect cute cuddly animals but I'm wrong)
• Platformer
• Visual Novel
• RPG Maker
• Bullet Hell
• Survival
• Rogue like

Although I am currently hiding 8041 games (and counting since the changes with free games being given away), this also includes games I am somewhat interested in.

Hm. I don't hide them by tags, but by number of points needed to enter them. So I hide everything between 1 - 5 points and half of stuff between 6 - 9 points.

Plus stuff like VR, horror and multi-only games.

It's not really a key word, but if the steam page of the game is poorly translated, or the only reference that the can come up is a random youtube streamer, I don't care about joining the game at all.

Simulator
Survival
Easy Access

I only have 2 hidden games, a MOBA and some meme crap. I used to have a lot more, asset flips mostly, but they've all been added to the non-giftable list by now, and since I only enter wishlisted games 99% of the time, I don't really care about hiding games.

That being said I'm kinda sad to see so many people hiding visual novels and RPG Maker games, although with the amount of boob games and generic draque clones that make up most of those tags, that's to be expected :/

It's more about the tags not included for a game, and yes I do open up the steam page of every game I hide.
Currently approaching 8000 hidden games :)

Game.

Rpg maker
Hidden Object

Really not a lot. I always keep an open mind because I never know what I'll enjoy. I surprise myself with games that I enjoy. Really it's refreshing to play something different that I end up loving.

Current list:
Visual Novel (only see pictures? boring)
Nudity
Sexual Content
Telltales
RPGMaker (all of them are
Online
Collectible Card Game
Clicker
Idle
Cat
Dog
Pet

anime
sport
moba
mmo

Simulator.
Also VR and PVP.

VR

VR just VR die VR

Bullet Hell
Card Game
Difficult
Meme
Otome
PvP
Rhythm
Rogue-like
Rogue-lite
Shoot 'em Up
Twin Stick Shooter
Visual Novel

It may not count as "hide GA", but when I see 3 copies for GTA V... ⍜ᨎ⍜

Anime
In-Game Purchases
Visual Novel
RPG Maker
Horror
Walking Simulator
Fast-Paced
VR
Tower Defense
Zombie
Massively Multiplayer
Documentary
Movie
Software
Classic

VR
Soundtrack

Almost any game that is listed in the "featured giveaways" section at the top of the page. Especially games with a price of $0.99 or lower.

I have about 600 of these games in my hidden game list and still new ones keep popping up

VR
Anime
Sports
Survival
Multiplayer (if that's the only mode)
Platformer
Meme
Rogue-like
Tower defense
Racing
RTS
Difficult

And all these tiny indie games with cardz for profits, but that's more about general impression than exact words.

JRPG
Bullet hell
Meme