Almost by definition, infrastructure cannot and should not be a place for disruptive innovation. Even by the giants. It's the common foundation upon which innovation sits.

I would argue that in operating system platforms, the occupation is not the exclusive realm of the giants, though they collectively pay for a lot of coders of Linux core components so that does give them an indirect influence. Still no one influence holds outsized sway of which I'm aware.

The decision-making processes of IETF, GSM and other infrastructure standards bodies are biased towards slow, incremental progress in with a usual emphasis on not breaking things -- the exact opposite of the unicorn "move fast and break things" mantra coined by Zuckerberg who later recanted once Facebook got big enough to itself be considered an infrastructure of sorts. "On May 2, 2014, Zuckerberg announced that the company would be changing its internal motto from "Move fast and break things" to "Move fast with stable infrastructure"."