Megan McArdle was a speaker at the Institute for Justice, for which she almost certainly was paid, and didn't disclose that little fact when she quoted the Institute for Justice. She's mentioned them several times (especially in regard to Uber) and told everyone they were a "public-interest law firm advocating libertarian causes," but she didn't tell her readers that they had employed her.
Is Uber paying her as well? Who knows? Maybe they just depend on IJ to do it for them.
I know, I know. Nobody cares, not her employers, her readers, or the fellow journalists whose reputations she's helping to throw in the crapper. She'll remain employed as long as someone needs a lying propagandist.