Because tolerating censorship, and tolerating censorship at your own expense are 2 different things.
That's why. Go back and have another read.
A protectionist market means an illegitimate consolidation of wealth and influence into a tiny number of hands.... using State ostensible power to 'protect the consumer' to instead protect politically well-connected providers (from would-be competitors).
It's like the mafia which controls the newspapers in a city, making sure only 'qualified' journalists publish stories. Where they determine what 'qualified' means, and it definitely excludes those journalists critical of city newspaper 'regulators'.
If the mafia approves of your business in this city, you might be 'tolerant of censorship', but not at your own expense. At the expense of your competition, more like.