Part of the response was the IAHC which came up with the template for the fix: break up the monopoly by splitting registries and registrars, force Network Solutions to relinquish some of its TLDs, and create more TLDs.
https://en.m.wikipedia.org/wiki/IAHC
This was not immediately successful, until Postel (as IANA) instructed the root DNS operators (other than Network Solutions) to get the root zone from IANA instead of from NetSol. This caused an epic shitfest, as a result of which Postel reverted the root zone change, and the US NTIA got moving and started the foundation of ICANN.
The company now known as Verisign is the direct successor of NetSol, and they still control .com and .net, and feed the root zone to the other root server operators.