And furthermore - the companies in question are true megacorps, ie evey bit of additional power/money they get (and for the matter of this pov: you give them) goes to absolutely the shorties practices and abuses ever.

It's a moral thing - I protect my data for the same reason I recycle or consider my (indirect*) carbon footprint.

(*indirect bcs more like which companies or people I support)

With your data you support misinformation, deregulation lobbying, (any) government shitty things, ad culture, anything to protect the stock market as-is or their stock falls, dogshit approach to keeping their respective monology over their market, ... and their size and reach allows them to just be bigger than a lot of things like municipalities, even smol countries, the quid-pro-quo aint in the peoples favor.

I simplified example (bcs someone else already made it happen) - imagine, if Google autonomous cars go on sale, suddenly railways projects disappear around you.