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The use of should in the sentence “Should you choose to work under the table, it is your responsibility to be informed of the potential consequences of working on a tourist visa” (4th paragraph), is correctly explained in the alternative:
Should is used to express advice. It is possible to use it before the subject in affirmative sentences when the writer/speaker means to advice someone very politely.
Should can be used as a conditional, meaning if. When used as a conditional, the writer/speaker wants to soften a very dangerous situation as working illegally in a country.
Should is a modal verb used to express advice. In the sentence, the writer is advising the readers there can be consequences in working under the table in Brazil.
Should can be used as a conditional. It has the same meaning if does, but its use is pretty formal, not being very common in general oral interaction.