lubwak: Guys, I appreciate of all of the answers!
For one, I'd like to stress that one can still use their own computer for gaming and nothing else. No change of hardware or software is necessary. The security thing should be OS-related. Other companiones have nothing to do with it. Or it should be that way, although we know how all of those shady services and their relationships are.
Two, as clear as it is that GOG is pushing Galaxy (which is weird, given how its lacks some of the basic functions, such as sorting titles according to the purchase date), but it is in their *interest* to show their advantage over Steam. It's been very hard and they haven't had a lot of success. Steam dropping Windows 7 is *THAT* selling point that may draw attention especially now and closer to the end of this year, when Steam's support drops. It'd be foolish for GOG not take advantage of that with all of the outrage caused by the decision.
About te Win7 usage. Man, if you ask 10 people owning cars if they have a car, you cannot claim that ALL people own cars. Steam polls are such select market piece. I do not care about those for several reasons, and I got a prompt to take it earlier this year. There are even people still using Windows XP in India and other countries like that.
While we are it, I have had problems with XP era or earlier games not running on more modern systems and I could play them on my old computer with old software if it weren't for forced upgrades and lack of software/driver support. But that market, back then, was still much smaller back then and my library is MUCH larger these days.
I do not want to use Windows 10 or 11. I've tried them and I really dislike a lot of things about them, especially of you try to monitor whatever happens on your computer. I do not want to be forced to change my gaming computer (my work computer uses Linux) and GOG should use "moral ourage" of people like me to boost its market share.
TLDR; It's not only in its potential customers' interest, but also GOG's to challenge Steam on this one. Galaxy support for Windows 7 would definitely help, but I realize it is unlikely.
What outrage? You want them to support WinXP and DOS too? Software development moves forward, and making things backwards compatible takes time and effort. It's not as simple as "Just make it work on older systems", because things that work on newer systems often don't on older ones due to new capabilities of the softwares. They often require engineering workarounds. So since almost no one on Steam uses Win7, they decided it wasn't financially viable to keep developing workarounds to get things working on 7 that just work on 10 and 11, and they can spend that time and those resources making things work even better on systems that people will appreciate instead of letting the luddites who use older systems hold everyone back so that things can be developed to accommodate them.
GOG officially dropped support for WIN7 before Steam did.