[dfc]

I imagine that OP is referring to batteries with no protection circuit and the positive and negative terminals of the batteries being exposed[1]. The Samsungs in the keyboard do in fact lack a protection circuit. I don't know if banning the sale of battery holders is going to be a great fix.

[1]: Something like this: https://www.cpsc.gov/Newsroom/News-Releases/2021/CPSC-Issues...

[TheJoeMan]

Yes that is a good link summarizing the issue. If anything the perpetuation of the practice is making it harder for the actually-safe batteries. For example, TSA bans checking loose cordless drill li-ion batteries, despite them obviously having full PCB circuits inside with charging and short-circuit protection.