"Providing cover" includes increasing the anonymity set. Anonymity means there is an equal distribution of probability that any device connected to a network i

"Providing cover" includes increasing the anonymity set. Anonymity means there is an equal distribution of probability that any device connected to a network is the one sending the message. If you have 3,000 exit nodes and 5,000 exit nodes, but 10 people using the network, oppressive governments have a higher chance of fingering a culprit than if there were, say, 1,000,000 people using the network. That's what is meant by providing cover here.