Forcing someone to not do something that affects only their personal life is not why I pay taxes. The government has grown to be too intrusive, and it's getting worse, now risking the termination of the internet. As it is, the government doesn't do much real work that actually improves people's lives, and now it wants to make their lives worse by taking away their freedoms.
The liberal democratic argument is that the websites themselves are the ones imposing these harmful effects on their users, therefore by a JS Mill 'harm principle' argument it's fine for the government to intervene and regulate the websites, same justification for regulating, say, the sale of tobacco or knives.