The legal situation is more complex and nuanced than the headline implies, so the article is worth reading. This adds another ruling to the confusing case history regarding forced biometric unlocking.
Nope.
Samsung A50 doesn’t have this option.
Will keep an eye out for it though.
If you don’t, just force power restart it. You can search this up online for your model.
https://www.hardreset.info/devices/samsung/samsung-galaxy-a50/softreset-second-method/
Depends on the rom. It’s in Android since 9. Samsung definitely has it, but you have to enable it