[sofixa]

As long as you don't interpret monopoly to have to mean 100% market share, but an overwhelming portion of the market, enough to be able to disrupt it, prevent any new entrants, and abuse the leading position without the fear of repercussions, plenty.

* Google in search, video, browser, email

* Meta in social media for massive age segments (what, 30-70?; younger than that may be on Snapchat/TikTok (too))

* Amazon in online retail, and specifically in online books and e-readers

* Microsoft in desktop OS and productivity suite, especially for business

If we go into oligopolies, where there are a very small amount of market players that can still abuse their position, we can also add video and audio streaming, mobile phones and tablets, CPU and GPU manufacturers, smart watches, etc.