According to ProPublica, Thomas routinely accepted ultra high end private jet flights, super yacht trips, lodging, etc. from a right wing activist and never disclosed them.
www.propublica.org
SCOTUS isn’t bound by any judicial ethics laws, but any other judge would be in deep, deep shit for this level of corruption. He should resign due to this. He won’t, but he should.

Clarence Thomas Secretly Accepted Luxury Trips From Major GOP Donor
Island-hopping on a superyacht. Private jet rides around the world. The undisclosed gifts to Thomas have no known precedent in the modern history of the Supreme Court. “It’s incomprehensible to me that someone would do this,” says one former judge.
SCOTUS isn’t bound by any judicial ethics laws, but any other judge would be in deep, deep shit for this level of corruption. He should resign due to this. He won’t, but he should.