I agree - I think yubi missed the thrust of this question. Matrixport is a legitimate company; however, the advert is not. Matrixport does not have any offer of this type and the website in the address is all wrong.
Essentially, Brave have accepted an advert from someone holding themselves out to be Matrixport when they are not. While I don’t expect Brave to work out whether a company is a sham (they previously advertised World Markets, which was a crypto scam, but have no issue with Brave on this), but they should have a system in place to make sure that an advert is being placed by the corporate entity that is being advertised. If they don’t then users will quickly lose trust in Brave adverts.