I would refer to the recent FTC questions to “algorithmic pricing practices”. Long story short it was about some companies are using browser data, accounts data, etc. for “smart” pricing. Your brother may not care about someone watching him but I don’t think he wants to pay for the same goods more than others.

deleted by creator

That is what I need! Unfortunately, it is for US only… Is there, maybe, something similar in European region?

Unfortunately there are a very small amount of places when I can pay with crypto… I do not want to face also questions from AML officers. I’m not a journalist in the dangerous country or political activist, so Monero looks like an overhead for me.