Go to the store page of any of the games tagged with that icon. On the right side where you have the game characteristics (Single-player, Achievements, Steam Cloud etc) you will see a new item: Steam is learning about this game. There's a question mark next to it which explains what it means.

thread on forum
https://www.steamgifts.com/discussion/JNrSM/steam-is-learning-about-this-game-valves-newest-action-against-fake-games
https://i.imgur.com/KW7onFU.png

IndieGala by default calculates that most everyone will use the happy hour, meaning buying 5 packs of the bundle will cost about 1.50 USD/pack at worst. This is why seemingly their base price is a lot higher than everyone else.

yeah and they make tons of problems on steamgifts too, I definitely approve the quality control (until 1 month ago every day you had 3-4 5000 achievements shovelwares).. but I don't know how to think about this abundance of "learning".. 2 over 3 new games basically are under "steam investigation" xD

Did you discover your interest by looking at the relatively decent picture on Steam which displays and introduces the game? If so, watch the trailer. You might find that all of a sudden you have lost any interest in this title there's ever been.

definitely agree

It's the latest reason to hate Mondays. The only thing it motivates me to do is vomit.

It looks like a crummy ripoff of classic Mega Man. Honestly, I think it would be more worthwhile just downloading an emulator and getting the Mega Man games for NES and SNES.

Since these games don't give a +1 to your library, they seem to be excluded from the result of the API request for reading your owned games (they're considered just like banned games), meaning that SteamGifts can't know if you already own these games or not.
I would assume that userscripts that load your https://store.steampowered.com/dynamicstore/userdata/ (which is accessible to you only and contains the app ids of everything you own) would work, but I don't know if anyone already implemented that by now.