Because they don't have any reason to give any shits. 90% of their collected data is probably completely useless, but they don't have any incentive to stop collecting useless data, since their compute and bandwidth is completely free (someone else pays for it).

They don't even use the Wikipedia dumps. They're extremely stupid.

Actually there's not even any evidence they have anything to do with AI. They could be one of the many organisations trying to shut down the free exchange of knowledge, without collecting anything.