Really struggling to see how that answered his question.
Unless you would also count screaming into a pillow or punching a door as productive uses of time?
Takes us 10 seconds to sign but if enough people did sign it then its provides MPs who believe in revoking Article 50 some actual ammunition. Having a 5m signed petition from the general public isn't useless. Granted, the likelihood if it changing anything is very low, but may as well try right?