So Alphabet:
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is the developer the most used browser (chrome) and its open source skeleton (chromium) on which most of all of the other browsers are based on (edge, brave etc)
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has the most used video platform online, with no close second (unless you count porn, but i'd still argue its not close)
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has the biggest share of devices relying on its platform worldwide (android)
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has the most used search engine worldwide.
Alphabet has to be split up. Alphabet alone is deciding what shape internet will take in the future.