Organic growth towards computing and digital does that. Time spent online is increasing, services are getting better, people are moving to the cloud from on-prem etc. etc.
It's not a zero sum game right now. The moment FAANGs are in a zero sum game trying to cannibalize each others' market shares I predict HN won't even have an argument around if tech firms are too big. That means tech has plateaued and has become a mature business like Coca cola or Kroger.
Why is profit a metric that you want to minimize? Do you have any other metric that shows lack of competition? Because the above poster outlined some pretty strong positive ones
Thriving competition wouldn't result in super profits year on year.