Doesn't Switch provide its own DRM?
https://nh-server.github.io/switch-guide/
And of course, DOOM was ported: https://github.com/lantus/chocolate-doom-nx
It is an extremely locked down platform. Nintendo does not want you sideloading stuff onto it. Your OP didn't say it's impossible, they said it's hard, and they said it's locked down. Both things are true.
Nintendo is infamous for battling side-loading harder than anybody else. This has been a battle for ages, one I've been following since at least the DSPhat. And look through their history - a big reason they were so successful in the second resurgence of gaming (after the failure of the Atari era) is possibly because of how locked-down their platform was, how stringent their requirements were when it came to games. Game developers hated it because Nintendo would go so far as to control how many cartridges could be on a given store's shelves (stores hated it too, because money was being left on the table every time they sold out, which was almost always).
Long story short, just cause hackers keep winning the fight against Nintendo, doesn't mean their platforms aren't locked down.
You seem to care so much about DRM that you'll demand a refund and use a DRM-free service instead, and yet you own a Switch which is itself a closed platform heavily laden with DRM?
Of course the Switch has DRM, but it's also the only device I own that can play portable games and is not my phone, which I have no interest on playing games on. $5 to relive childhood memories on my bus ride to work is well worth it, but not if it's a crippled version of a re-released game that won't work in a few years.
If you avoid DRM 100% of the time without exception, then video games become just about impossible to play, with the exception of GOG releases.
I'm not sure "didn't want to create another account just to play a game" fits under this umbrella, but I'm more curious what exactly you're trying to prove here. If one DRM implementation is distasteful to me, then I should avoid all implementations of DRM? I don't want my PC rooted by a music CD with poor DRM on it, but I still watch DVDs and Blu-Rays and download streaming content through a closed-source plugin.
People have many interests that are often at direct odds with each other. You do what you can to find a balance and live according to some sort of principles even if sometimes engaging in extreme flexibility. Nothing unique about that to DRM or consoles.
So much so that I requested a refund from Nintendo who notoriously does not do refunds on eShop purchases. It actually worked, and I was refunded my $5 yesterday. Couldn't be happier to have voted with my wallet. Hopefully others did that too. I won't be re-purchasing DOOM either because I no longer want my money in Bethesda's pockets.
I _will_ however continue playing my $2 copy from GOG that I grabbed shortly after requesting the refund.