I have similar feelings with The Tale of the Princess Kaguya.
Magiccupcake
I think you undersell how feature rich steam is for both users and developers.
They offer community forums, reviews, mods through workshop, cloud saves, automatic controller support, openish vr ecosystem (epic cant even do vr, if you buy a vr game you likely need to use steamvr anyway), broad payment and currency options, regional pricing and guidelines, remote play, and more I'm sure.
This is much more feature rich than even console platforms, so I think the 30% fee is justified.
And they do this all without really locking down their ecosystem.
Recent controversy over an absurdly high failure rate.
https://www.theverge.com/22291828/sandisk-extreme-pro-portable-my-passport-failure-continued
Might be fixed now, but i wouldn't gamble.
Your best bet is probably to make your own.
Find a high quality NVMe drive and put it in a USB enclosure.
If the USB ports or anything other than the drive fail, the data is easily recoverable.
Given your use case, buying an external drive is probably fine, just don't get one from SanDisk.
Give it a decade and economies of scale, and maybe it will get it down to twice as expensive.
Calcium carbonate, is the main ingredient in tums, and is the main component of limestone.
Honestly, it's so easy to block accounts, so if there's only one bot in you community you should just keep it.
If they don't like it they can block it.