Professions that find it difficult to flee abroad even if taxes are high

What else could there be?
Would it be professional groups that are granted licenses by the state?
Like doctors, pharmacists, lawyers, accountants, tax accountants, or judicial scriveners?
For these professional groups with state-issued licenses, even if they are heavily taxed, it wouldn't be easy to move abroad because their licenses lose their validity there.
Since they are groups that make a living using licenses that are only valid within the country.