[sylware]

First, big tech corps should not be own/steered by the same network of ppl, aka blackrock/vanguard.

alphabet(google)=msft=apple=starbucks=etc...

One other angle is to regulate them stronguely via interop with technically simple, but able to do a good enough job, and stable in time protocols/software.

For instance, tons of google services can work with a noscript/basic (x)html browsers, games from msft own studios should seriously run on lean elf/linux distros, etc.

[sylware]

well, maybe not linux since its userspace ABIs are not at all stable (evolution of symbols and versions from the glibc is close to the speed of light).