On the other hand making them harder to access also makes the ideas spread slower because if you get all of say white supremacist sites off Google you massively cut down on the number of random 'normies' that will fall in and get swept up in the group. Same thing applies but is probably even more effective for getting groups off the regular internet all together because then you have to convince someone to install TOR (or whatever the new flavor of the month is) to get them into the funnel.