His self-interest aside, this is a huge deal for Palantir, the company that he helped found and has many federal governments as their client. Also, in a sense, Thiel ensured that Silicon Valley didn't completely lose touch with the White House and will have some leverage in influencing them. For starters, immigration is a key issue for Silicon Valley for which Thiel can be a voice of reason to influence the new administration.
I don't agree with many things Thiel says or does. That said, this was a brilliant execution.