Depends on the game, sometimes you can just delete the steam dll next to the executable, others require a steam emulator which amounts to just dropping in a spoofed steam dll. I think the preferred emulator these days is Goldberg steam emu on gitlab.

Doesn’t matter, Steam offers DRM free games. Steam DRM is opt-in and can be broken by anyone in seconds, and games with other DRM have a big glowing warning on their store page. You give money to Steam for their servers that support multiplayer, their workshop, seamless patching, user forums, image hosting, controller support, Proton for Linux, SteamDB, easy multiplayer via the friends interface, achievement tracking, and a large majority cut to the developers. Your complaints apply to basically every storefront, the only way you’ll own data is by having it on your own disk which Steam lets you do.

Someone who’s going to use Ubuntu wouldn’t know what “debian,” “mint debian,” or “canonical” are. You should include an actual explanation or link to what you’re referring to when trying to help beginners otherwise you’ve failed to help them

This is a lot like saying YouTube is evil for allowing anyone to upload videos to their platform

This is still easily verifiably untrue in practice. Go to isthereanydeal and you’ll see verified, approved Steam key retailers running sales for under the Steam price on hundreds of games literally every day. Humble offers a global discount on all keys in their store if you’re s subscriber, undercutting virtually every Steam page. That’s not to mention the bundles they sell which regularly cut hundreds of dollars of keys down to a few bucks.

I’ve never understood this complaint because it takes no effort at all to just ignore these games