> every market is a matchmaking service between the seller and the buyer
No, markets are not matchmaking services. Markets are places where people make matches, matchmaking services are a service that is sold in the market. Notably, its the core of the service Uber and Lyft provide, and its low friction to switch, as a user or supplier, between them. This is a special characteristic of the kind of service Uber and Lyft are selling.
> "which is not true in many other industries" : how can we know?
Because we can readily observe that what many other industries are selling is not matchmaking services between single-worker-provided services and purchasers of those services with low switching friction for workers because local competition exists which can readily absorb additional workers because there is little capital dependency for the service being provided that isn't carried with the worker and there is low friction for consumers to switch between service providers.
> You're saying deregulation doesn't work in other industries because they're already regulated.
No, I'm not saying either that deregulation doesn't work in other industries, or that to the extent it doesn't its because they're already regulated. I'm saying the specific features of the market in which Uber and Lyft are operating which provide significant leverage to their drivers to improve their labor conditions by leveraging competition among potential employers does not exist in most other markets, and so is not simply generalizable into "improvement in working conditions come through competition not regulation" (and that, additionally, history provides plenty of examples of improvement in working conditions that came through regulation.)
It certainly illustrates how workers can, in certain market conditions, leverage competition between services through which their labor is marketed to improve labor conditions, and its certainly worth understanding for that value.