It literally has the second most concurrent players of any game on Steam at the moment and still has over half of the concurrent player numbers compared to its peak 8 years ago.
Mainly because Steam actually provides a really good quality service. Most corporations over time charge more while getting worse on quality. People can sell their games for cheaper on Epic which only has a 12% fee, but Epic’s service is much worse.
They don’t really though. They’re talking about selling steam keys in a different platform, not selling the game on a different platform (like Epic Games for instance). You can sell the game for cheaper on Epic or GOG if you want to.
Do you worry about burn in on your phone? Your phone probably has way more static elements that are constantly on than the Steam Deck will.
I used my last phone for 4 years and thousands of hours and could only barely tell there was some burn in if I used a white image at max brightness and looked at the status bar. Burn in isn’t really a problem with modern OLEDs.