I signed it the day it launched. Personally, I don't care if it's been botted, I also think there are plenty of Brits abroad to sign it. I don't care if parliament hand-waves it away when they have to debate it. I don't care if it changes nothing. All this means is that I am still in the same state I was before the petition existed.
I care that it's a brief moment of like-minded people sharing a small bit of solidarity and sticking two fingers up at this, frankly, farce of a government.
Remainers know that the government gives nary a fuck what we plebs think. The ref result would be invalidated had it been binding. Plenty of polls about to show the nation has in fact changed its mind.
Petitions, marches, demonstrations - they rarely effect radical change, but they do serve a purpose, and that is freedom of expression, conscience and opinion. It reminds politicians that they are neither omniscient nor universally approved of. It is, in fact, an expression of democracy and I happen to think that is all to the good.