It's a full time job to answer completely, but from what I know he finances escape fantasies for the rich which they call seasteading. He calls it a libertarian ideal to create these new colonial city states, but what he means is liberty for his ilk from taxes, regulation and societal rules. Meanwhile his brainchild Palantir erodes the rights of the poor people who are left behind through surveillance, military technology and ICE funding. But this is all in line with his ideology, because apartheid "works" in South Africa according to Thiel