I'm mostly with everything but the second half of your first sentence here, but unfortunately that embeds such a huge misconception that the net value of your comment could very well be negative unless you acknowledge and clarify/correct this.
The boundaries of Apple, Microsoft, Google, Amazon, etc. are "arbitrary [and] invisible" to some extent, and obviously drawn by the powerful. But "the current set of lines are arbitrary and clearly not the only possible solution" does not imply that "no lines is a better solution"; indeed, the latter has only been empirically true when there are preexisting strong and stable force(s) which perform enough of the function of explicit admission criteria to render the latter unnecessary. In real life, you find formerly-exceptional institutions which quickly and irreversibly declined to a lower level after switching to the open admissions policy that your phrasing advocates for (consider the City College of New York in the 30s-60s vs. afterward).
Instead, the most impressive results in both hiring and immigration policy have combined race/nation-blindness with a distinct lack of blindness to other criteria which really do matter. You cannot do the latter (and perhaps more importantly, properly incentivize cultivation of the relevant personal and institutional qualities across the world) without maintaining some "arbitrary, invisible" lines across at least a multi-decade timescale.
So, more immigration and education of foreign students? I'm totally fine with that, for both national and universalist reasons. (This is particularly clear for India, which is a natural US ally. None of the 'frenemy' complications we have with China; I WANT Indians to 'steal' more of our tech!) But only on the right terms, which are not being offered by anyone using the language you're currently using in the second half of your first sentence. I suggest that you explicitly distance yourself from those people if you want the rest of your comment to be heeded by anyone outside your tribe.