I think Pink News might have made sticker printing companies' future profit margins look more cheerful.
It doesn't even need a protest attracting meeting place to organise.
People can just knock up a similar design, order a small run, and pop them up as they pootle about town/the country.
They don't need to keep TPTB at twitter, youtube, google, facebook etc happy and can say exactly what they want.
There is no time limit in the way there is with an event. It can be an rolling snowball, organically picking up more and more mass, for as long as it likes.
Posters might be fun to make a grand gesture of tearing down, but stickers are just a frustrating pick pick pick to get off and nobody can pull off looking like a Glamorous Gender Gladiator doing it. So less motivation to keep on doggedly removing them.
The public will look, talk about and remember them, cos it has the "well duh ... oh.. right I get it!" factor.
It's so simple and so very, very clever all at the same time.