It was incredibly disruptive, and continues to be so where 90% of servers runs off of it and almost all embedded systems use it.
Are you just trying to troll, or are you trying to rewrite history?
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
I assume disruptive means the world would be different without the product.
Similarly, Git not being around wouldn’t change much practically speaking. For all we know, Git won because of Linus. Otherwise other version control were and are similar enough. Mercurial is a prime example for the nascent time period.
OTOH, GitHub changed things. Moved from Sourceforge and in some cases, some of the mailing lists/personally hosted source codes + being part of the reason some open source stopped using some of the popular but in my opinion, kitschy and lackluster bug trackers. GitHub also inspired the copy cat Gitlab project which is now itself a unicorn worth $2B or so. Yes I know Gitlab has differentiators before and even more now. It being very heavily inspired if not lifting from GitHub for parts of it is a point of GitHub’s influence, not a critique of Gitlab.
It isn’t as certain that we would have one such dominant platform like GitHub and the new runner up and alternative of Gitlab if GitHub didn’t exist.