Or, it’s really not-
It’s unlikely you’ll kill your SSD unless you’re actively trying to.

AFAIK it’s actually almost all from one district in US- https://en.wikipedia.org/wiki/Spruce_Pine_Mining_District

The actual story buried at the end of a Sino #1 article-
In the United States, companies like Oregon-based ESS Tech Inc. are already deploying iron flow systems for tech giants like Google.
However, some of these existing designs could struggle with “dendrites” — tiny, needle-like crystals that can short-circuit the battery. The Chinese team believes they have leapfrogged these hurdles by using an alkaline-based chemistry and their new molecular “shield.”

ARM isn’t the reason why it won’t work for long.
It’s cooling, as soon as the phone thermal soaks it’s throttles down - phones can’t have a decent cooling system since they use power (fans EAT power), degrade water resistance and just add weight/bulk that most don’t want in a phone.
The handhelds you’ve listed aren’t phones. They’re handhelds that do in fact have heatsinks - they’ll work fine.
Again this isn’t anything against ARM, it’s the idea that a phone form factor with zero cooling considerations will somehow best a device with those considerations.
Owncast if you’ve got a decent enough internet connection.
Consider- a ‘decent’ 1080p h.265+opus stream will be around 8mbps, if you’ve got 10 devices watching, that’s 80mbps, you’d really want 100mbps+ upstream bandwidth to do that.
If you’re lucky enough to have 1GBPS/1GBPS, then you’re probably fine for a hundred or so devices, if you’re stuck on an asynchronous connection, do consider how much upstream bandwidth you (they) have.
I was wondering what this had to do with technology but-
eh, fair enough.