>>7They do. The two websites I am aware of that got canned by Cloudfare, daily stormer and 8chan, both have Tor sites. And there's no "at least" about it, i2p isn't currently more secure than Tor, very undertrafficked.
Related fact is that, several hours ago the admin of dark.fail listed the 8chan onion in his darkweb directory but the drug dealers and pedos bitched him out so hard he took it down.