If we split up google what would likely happen is that youtube and gmail would simply die
Or compete on a level playing field with Vimeo, Fastmail and so on. Everyone wins if Google is split up. Even Google shareholders, who will finally get some nice dividends when the ad business money isn't being diverted to prop up the rest of it.
Google recently announced a 25 billion dollar stock buyback so investors are definitely getting some returns. Also, I'm pretty sure most investors are happy with their investments in waymo considering it has been valued by some analysts at over a hundred billion dollars despite not making any revenue yet as far as I know and I've read they have invested over 5 billion dollars into it which is pretty much out of the realm of what even SoftBank would invest in a company with no revenue yet.