Tax payer's money payed for most of the infrastructures, research and education those companies requires to operate.

How can you run a company like Google or any other without educated employees, roads, internet, etc.

Entrepreneurs love to think they built themselves alone, but they are just a product of the society they lives in.

Now as a society you can choose to either socialize or privatise your infrastructures, but you'll have to pay for them either way.