This ^^^ is WHY they allow it.

In the early days of the internet, a congressman petitioned a bill to have the internet regulated for porn and that porn sites be mandated to have a specific tag like .xxx so that filters could more easily keep it out or have it for pay-for only.

But he was shot down.
The communists (TPTB - 'communists' in my terminology just means globalists who basically think that the masses are cattle to do their bidding and laws do not apply to them, like the Ruling Class Vs the Plebes in CCCP) - are working towards the destruction of civil society and will use every tool to their advantage.
Same reason they want to teach sex ed in kindergarten. Poison the minds of children as early as possible.
There is a war on against civility and decency.