[setr]

I'm not sure disruptive is best attributed as to only mean market creation. Even the basic definition of the term doesn't suggest the construction of something new, but rather to undermine an existing system. And in that sense, I'd say the linux kernel did help dissolve the previous era of Unix-as-a-product market, and the industry that ran on that model (solarix, aix, hp, etc).

And while linux itself did not construct the open source market, linux + GNU did together strongly reroute the software (syadmin, dev) market towards open source models -- which of course screwed with all tooling development companies dramatically, creating the awkward divergent setup of SaaS w/ subscription vs Enterprise on-prem companies we have today (on-prem for non-enterprise mostly getting covered by OS) -- and that divergence is a pretty clear indicator that some kind of disruption occurred

[betterunix2]

It sounds like you agree with what I said: the GPL disrupted the market. Linux did not have anything to do with that and GNU was already making waves before Linux came along, and the effort to release BSD under an open source license was already underway in the late 80s. The shift you described would almost certainly have happened if Linux had never been written.