Though Tyson can understand the worry of constant surveillance, he finds the cameras around London to be a comforting presence.
Wherever he goes, backup from the web is never far away. If he can spot a security camera and get close enough to clearly blink at it, Tyson can guarantee getting a message to the Moriarty Mirrors, even in situations where he couldn’t use his phone without alerting the people around him.
He knows that if he ever goes missing, the web can track him down and rescue him that way. There are times when that isn’t true, when Tyson is purposefully avoiding the cameras’ gaze to avoid enemies of the web tracking him, but in those cases, the web would already be aware of his intended destination and could track him down that way.