Governments are allowed to create monopolies when it is in the public interest to do so. For things like utilities, it would be cost prohibitive for _every_ utility to develop completely separate infrastructure to every single home – we’d end up with either endless construction or no company seeing it as profitable enough to develop infrastructure at all.
To combat this, government will often allow a single utility be a government sanctioned monopoly so they make that infrastructure investment. This often comes with restrictions and stipulations on quality or cost of service (but not always).
So your cable company is an allowable monopoly because the government gives them permission to be one in order to get them to install the cable.
Tech companies are not utilities – there is no infrastructure investment to get Google search to your specific home – so there is no reason for the government to give them monopoly status.
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