It is actually possible to change the rules with sufficient notice period and to write enough details that people have a chance to understand exactly how the rules will change.

They're not doing that. This is a choice they are making.

A continuous series of overreach and calibrate the amount of rollback needed based on response makes sense if you're keen to push things to the limit society will bear without rioting

>This is a choice they are making.

yup

Yes, the choice is to prioritise American software developers when a lot are out of work.

It seems eminently sensible to stop cheap labour from abroad in such a situation.

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The trouble is that also gives a period to understand how to circumvent the law or capture the regulation.