Learning about these companies is a good first step, but what can we do about it? How does this knowledge going to help?
So to answer to your question, Nothing. You can write 100 letters to your senator, MP, mayor, etc. The "system" will serve its purposes. Best case you will get a response that "national security, paedophiles, terrorists, bad actors", etc.
In some regions you can file a GDPR nightmare letter, which will be shut down because of EU DPR ("national security, paedophiles, terrorists, bad actors", etc.)(yes I copied and pasted from above.. there is a pattern here).
Historically (and Harari describes this far better in "Nexus") documentation and bureaucracy was created to exert control. Any information 'must' be captured, stored, processed, assessed, flagged. Before we only had letters and radio. Now we have more letters (bits and bytes/packets). The mechanism is the same. Collect, store, process.
Cross-referencing this with 1984, everything we do/say/send/etc. will never be forgotten, can and will be used against us. Politicians though can 'rewrite' history ('Oceania was at war with Eurasia; therefore Oceania had always been at war with Eurasia.').