[vbcr]

Not sure about Thailand, but this is true for USA.

My colleague's wife is on H4 (dependant) visa and prior to coming to USA, she had a job in India. We talked to a lawyer and then with USCIS and both of them confirmed that it is not a possibility that she can work remote here in USA on H4 even though she gets paid in India.

[znq]

What you can do though is travel to the US for business purposes.

[ashconnor]

Business purposes is things like signing contracts and participating in meetings. Not doing actual work.

[znq]

For some people that is their work.

[erkkie]

Anyone doing this should also check what qualifies as business to avoid confusion at the border (there are specific things one is allowed to do and specific things not, IANAL, YMMV).