I’m not sure what you mean by that, so just to clarify what I meant: A lot of countries require you to prove you have a sustainable income, so showing them you’ve earned 2500-3000 EUR every month for the past three years, and that you already have a contract waiting for you in their country, works. Showing you received 10 000 USD once when you can’t prove a sustainable income won’t do.
This makes it hard for people to move just because they got lucky with money once.

I’m not saying it’s a good thing or not, just that this is the case.