This is not a rebuttle to regulatory capture. it is in fact built into the model
These "small companies" are feeder systems for the large company, it is a place for companies to raise to the level where they would come under the burden of regulations, and prevented from growing larger there by making them very easy to acquire by the large company.
The small company has to sell or raise massive amounts of capital to just piss away on compliance cost. Most will just sell