Justices have many avenues for non-controversial extra income, like speaking engagements, books, and teaching appointments. All of them take advantage of these,

Justices have many avenues for non-controversial extra income, like speaking engagements, books, and teaching appointments. All of them take advantage of these, and all or nearly all of them are millionaires as a result. This generally receives little pushback as long as it is disclosed, and there is much less potential for corruption than secretly receiving "gifts" from political activists.