1, companies are not our friends
2, they ruined gaming foerever with lootboxes pioneered by TF2 and enabled the whole illegal digital gambling system with CSGO which is going for more than a decade now. They could shut it down but they don’t because they also benefit from it and the ship has now sailed. And it’s a billion dollar unregulated black market.
3, they ruined gaming forever with the whole battlepass system pioneered by Dota 2
Their model of cosmetic-only lootboxes is also far less obnoxious than the P2W form that has taken over mobile gaming. Many mobile games today are designed to be as obnoxious as possible in the hopes that the player will crack open their wallet for a shortcut.
My first thought was that lootboxes were a natural development of Japanese gacha toys, and Wikipedia's article does cite them as a precedent for lootboxes.
Not that it was a pay-real-money-to-spin situation, but Legend of Zelda: Minish Cap had a gacha-based minigame mechanic in the game, and that came out several years before TF2, let alone TF2's shift towards free-to-play mechanics.
They also have the goodwill for helping make gaming on linux practical enough that there can be a handheld gaming console that runs linux (plus, of course, popularizing that entire new market segment).
They also don't constantly change large parts of Steam. Point is, people like that Valve is relatively stable, and that's why they insist on sticking to it. The industry is otherwise such a shitshow. The stability is an especially important value for a platform that holds, in many cases, thousands of dollars worth of games for people.
When you've tried the others and then been denied playing your game because of their crappiness... it gets old quick.
In most other sectors the bar is higher. They've earned their near-monopoly fair and square (unlike Apple, they don't do anything to block competing marketplaces - they're not even preinstalled) by being head and shoulders above their competitors in terms of quality - the fact that that's due to those competitors all sawing their own legs off doesn't change that.
The recent #SaveTF2 fan campaign shows how little they care about that game, except for releasing new skins to sell every couple of months. https://www.save.tf/
I don't even expect a Steam Deck 2 now that every other manufacturer is making x86 handhelds. At release their main competitor was the Switch, which didn't run Steam. What's the point of making a new one when all the competitor devices will have Steam installed anyways? They haven't even released a generic SteamOS 3 install