Wouldn't it be meaningless, anyway, unless you compare it to the number of people who are opposed to the petition?
(Pending API availability)
Brexit petitions in realtime:
710,563 signed for remain - 65.81% #RevokeArticle50 371,020 signed for no deal - 34.17% #NoDeal
They were started with different context, and the remainer petition might only have traction atm because it is new.
Anyway - yeah, let's just decide everything with online petitions. Totally legit.