Assuming they would want to stick to an English speaking country of similar culture, how easy is it to get work permits and citizenship in Australia, New Zealand, Canada or the UK? It’s not clear to me that one can simply move.
Given the means you could live wherever you want, and come back to Trumpistan at required intervals to renew your visa.
Sure, “given the means”, but given my means I would still need to earn income while living abroad so how easy is it to get a work permit in those countries?
Maybe Brad Pitt could move but could I?
The question is: how easy is it to get a work permit in those countries? If I moved there next year could I find a job to pay my housing and food costs?
One does not simply walk into Australia.
A US Citizen can get a three month visitor visa very easily indeed, but it absolutely does not permit any kind of employment while here. Of course, it's possible to find poorly paid illegal work and to overstay, though you risk immediate imprisonment and deportation if caught.
If you want to get a work permit, you need a sponsor. The sponsor can be an employer (who needs to declare to the Immigration Dept. that they cannot find a suitably qualified citizen to fill a specified role); Or a family member (including a spouse) who is a citizen and who will declare that they will support you if you cannot support yourself, and that you will not attempt to apply for any government benefits. Sponsored permanent residency tales a long time to process, and requires many hundreds of dollars, not just for application fees, but also for a rigorous medical. You need to be healthy, and it helps a
lot to be young.
When I emigrated, I was sponsored by my wife; The application took almost a year, cost over £600, and had to be made from outside Australia - they won't let you stay in the country while you are being vetted. I was under 30 at the time, which was a major point in my favour.
If you are on the preferred occupation list, you might be able to get in without a sponsor. The list varies, but last time I checked, it was very short. If you are a doctor or a dentist, you have a good chance - but if you are over 40, you might have to commit to a minimum two years working in "rural or reagional Australia" - ie in the outback - to get enough points to qualify for a work permit.
You can also apply to come here for work of limited duration - for example as a representative of a US employer here to work on a specific project, or to attend a conference or convention, or as a professional athlete here for a specific competition. You will be required to leave when the gig finishes, though.
If you have Brad Pitt money, you can obtain a permanent residency on a retirement visa; It does not permit you to work, and you must not only show that you have sufficient assets or rights to a pension to provide you with a livable income indefinitely, but must also pay a non-refundable application fee which (last time I checked, many years ago) was $8,000AU.
New Zealand is, I am told, slightly easier to get into, but not much - they have treaty obligations to roughly match Australian rules for any immigrant on a citizenship track, consequent to the reciprocal agreements that allow free movement between Australia and NZ fkr each others citizens.
The UK is unlikely to be much better, though you can get in easily if at least one of your grandparents was a UK citizen. If you don't qualify on the grandparent rule, you are in the same position as someone heading for Aus/NZ.
Canada is likely the most difficult; They have similar rules to Au/NZ, but with the additional requirement that you learn French, as well as English. Ces Quebecois, ils sont fou.
All of the above is from my rusty memory, and may well have changed - but the trend has been to make it harder, not easier, so if anything I am likely understating the degree of difficulty.
Americans are welcome across the world, as tourists with money to spend. But you are expected to scurry in, empty your wallets, and scuttle off. If you want to stay, you will find you are a lot less welcome. unless, of course, you are Brad Pitt.
It's much easier to get into shithole countries, of course. Russia will take you, though you might be given a tin hat and sent to Kursk.