From WSJ: Amazon Says Email Ordering Employees to Delete TikTok Was Sent in Error.
I suspect Amazon realized late what a legal mess it is to ban an app on their employee's cell phone when they have no clear legal basis or governmental guidance. They banned employee using Huawei phones when I was working there, for some things -- don't remember exactly. But in that case, US government already banned it for its employees, so there is precedence Amazon can claim as legal basis.
Why do you think Amazon doesn't have a clear legal basis to decide which devices are allowed to connect to their internal network services? Or, for that matter, to decide which devices ca be taken into non-public, secured parts of Amazon buildings?
They probably got informed that since phones are personal devices and not company provided, this level of restriction might land them in the parts of BYOD laws that require employers to compensate for personal device use for work.
Amazon probably decided most employees don't have anything too sensitive and it's not worth buying everyone a phone.
I suspect Amazon realized late what a legal mess it is to ban an app on their employee's cell phone when they have no clear legal basis or governmental guidance. They banned employee using Huawei phones when I was working there, for some things -- don't remember exactly. But in that case, US government already banned it for its employees, so there is precedence Amazon can claim as legal basis.