I just find it abit ironic this is supposed to be the greatest thing since sliced bread even tho I’ve read multiple times Steam has bloatware and Spyware on it

Links?
Sure, it has the Steam Store on it, if that's what you're getting at. And it boots directly to Big Picture Mode. But that seems a bit of a stretch to call "bloatware and spyware". There's actually a bit of an irony in this claim, as SteamDeck suffers the same issues with Anti-Cheat software all of Linux does. Much of that stemming from an inability to stick the anti-cheat in kernel mode and keep the user out of it.
And Valve is so committed to locking you into SteamOS that they publish a helpful page with drivers and information for installing Windows. And on that point, Valve cares so much about lock-in that they are using open-source drivers. Also, Proton is open source and they keep pushing fixes back up to the parent WINE project. Indeed, these are the actions of monsters. (/s for the truly stupid)

it was created by two former Microsoft employees

Ok and? Active Microsoft employees have contributed to Linux. Hell, Microsoft has an active Linux distribution of their own, Azure Linux. And they aren't above submitting code to the Linux kernel. It also turns out that Microsoft has a long history of hiring talented developers. Seriously, go check out Dave Plumer's channel, the guy is wicked smart. Some stay there, some move on. Just because they worked at MS, doesn't mean they are now irrevocably evil.

and has DRM

Yup, that's built into Steam. We can debate the issue of "should DRM exist at all" but that's largely mental masturbation. Part of the reason digital delivery took off was that publishers felt comfortable enough that piracy wasn't going to eat their lunch. While I do agree with Gabe Newell that piracy is often an access and delivery issue, many publishers don't and we'd still be buying boxed copies at physical stores without DRM backing those sales. If you hate it that much, use GoG instead. It's a great option and it runs on the SteamDeck.

they used Linux as operating system does nobody see any irony in this ??

Linux is fucking everywhere. Seriously, the only place it lags behind is on the desktop. Linux has won in the cloud. It won so decisively that Microsoft spun up Azure Linux to deal with that. Half the internet infrastructure (routers, switches, embedded devices) which allowed you to post your drivel likely runs on Linux. Linux is on everything from physical door controllers to kiosk displays. Even NASA is getting in on the Linux game. Using Linux is kinda the default choice anymore. Valve choosing Linux was fantastic, as it pushed open the gaming market away from Microsoft's stranglehold. What they have done with Proton is nothing short of a miracle. It's let us gamers have some hope to escape the Window ecosystem for something far better. The only "irony" here is the irony lump between your ears. I'd suggest never getting near an MRI machine.