This is exactly what is already happening with Scots and American English.
If American media were to affect so much Anglic varieties spoken in Scotland, you'd expect SSE (Scottish Standard English) to increase in rhoticity due to said influence. And yet the opposite is happening.
Granted, the example is from SSE, not braid Scots; it works nice here though, since any potential non-British pressure would affect SSE first, then Scots.
The example also shows which Anglic varieties are threatening Scots: RP and its spiritual successor Southern Standard British English, both non-rhotic. That's because mere exposition towards another variety is not enough to trigger variety shift, you need some sort of [soft or hard] power over the speakers. Such as attacking their local identity to sell them an alternative one (governments love to do this shit).
Now, back into the hypothetical "international English": what pressure do you think that a hypothetical standard built upon the speech of L2 English speakers, mostly in continental Europe, would have towards Scots? I don't think that it would; at most you'd get some entitled corporation drone from London or New York screeching that "learning a dialect for international communication is too hard!" (i.e. a fraction of what others already do.)
Also note that the basic idea ("you aren't supposed to speak this natively") isn't too far off from how Esperantists promote Esperanto, except that it's towards a dialect instead of a full-fledged constructed language.
There is a world of difference between [spontaneous consensus between members of a particular culture or ethnic group]#1 and [the top-down enforcement (as in the case of Scots speakers being physically punished in school for speaking their native language)]#2 or [promotion of a specific dialect]#3.
I numbered them for convenience. #1 is a specific case of #3, and rather close to my "hot take" proposal. Nobody is proposing #2, this sort of Vergonha style linguicide is inhumane.
[I'd also like to reinforce that the idea is a "hot take". As in, I knew that it would be contentious, and I'm not exactly sure myself if it would be the best approach.]
I think that the RHEL example is out-of-place, since IBM ("Red Hat") is clearly exploiting a loophole of the GNU Public License. Similar loopholes have been later addressed by e.g. the AGPL and the GPLv3*, so I expect this one to be addressed too.
So perhaps, if the GPL is "not enough", the solution might be more GPL.
*note that the license used by the kernel is GPLv2. Cue to Android (for all intents and purposes non-free software) using the kernel, but not the rest.