We (Fediverse users in general) could start one. It doesn't need to start big, those things tend to snowball (in a good way) if people can relate to them. What we'd probably need is:
- a space to hang around, share info, and discuss the topic. A Lemmy/PieFed comm is enough.
- infographics and whatnot showing why we oppose ads, alternatives on individual and social scales, and addressing a bunch of "ackshyually" weasel words that are bound to pop up.
- ways to let people know that space exists. Yes, I know it sounds hypocritical, but basically advertising an anti-advertisement community.
- ways to multiply that space, outside the boundaries of the Fediverse. As in, to gather support for the cause without centralising everything here.
- ~~pipe bombs, masks against pepper spray, Molotov cocktails.~~