From the side-lines it looks like they're slowly becoming an unstoppable dominant force, what's surprising to me is AWS's / GCP's inaction, they're either asleep at the wheel or they don't see Microsoft's dev mindshare grab as a threat.
But I do wonder if AWS will try to buy gitlab.
Even GitHub was never in a position to go public, that seems to be mere postering to drive valuation or attract M&A offers.