Stuff like truly extensive regulation or outright central planning is nowadays relegated to narrow settings where market entry is considered infeasible and a "natural monopoly" cannot be avoided, so there is a real need to "carve out" the portions where competition is not feasible and apply strict regulations to those. That mostly applies to public utilities and a few large businesses like airlines, etc. Internet-provided social platforms may be in the same boat.
Example: there were no laws preventing diluting stock during a hostile takeover until after Vanderbilt tried buying out the Erie Railroad and diluting stock was a way to swindle him [1]
[1] https://en.m.wikipedia.org/wiki/Erie_War#Watered-down_stocks
They react to different types things. Both types are important, which is why we need markets as well as some amount of regulation.