I wouldn't be opposed to going after such situations as corruption or conflict of interest issues, but that's going to be a big can of worms.

From the FAA and Boeing to multiple health agencies and pharmaceutical companies, there are a ton of advisory type roles that involve industry leaders "recommending" policy. I'd be surprised if Musk ended up at the top of the list when sorted by impact, counted either by financial impact or number of rules and regulations impacted by industry.