Poison the data that Big Tech uses against you
That is a fascinating article from MIT about how to fight back against the surveillance economy of Big Tech by poisoning the data that they are using. I think this is wildly interesting because it strikes at the Achilles heal of Big Tech, it requires your voluntary submission to their system. Yes you can ad block and try to avoid their services, but this is another interesting idea, flood their systems with so much junk that the real data is burred under the junk.
This is the equivalent of a DDoS attack on your tech overlords.
There has to be more to this that could be done.