No, it's a very easy alignment problem: just impose a tax on size.
That which you tax, you get less of. The tax is revenue-neutral, so it doesn't affect the government budget one way or the other. Full details here: https://news.ycombinator.com/item?id=39235533 https://news.ycombinator.com/item?id=39236786
The problem is that the government likes gigantic corporations. Big Government and Big Business love each other. Fixing that is the alignment and agency problem. It's much easier for bureaucrats to exert control over a highly concentrated industry whose players can be "invited to the table". Details: https://news.ycombinator.com/item?id=28588457 https://news.ycombinator.com/item?id=39162088
The hard alignment problem is making regulators want their own job to be herding 10,000 cats instead of 10 elephants. Everybody wants to be like the FAA regulating Boeing; nobody wants to be the USDA dealing with a million unruly and independent-minded farmers.