> You're just a pile of cash to them

You are currently a cost to them¹ - using your data as free training/refinement, and potentially selling², it is a way to offset that a little.

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[1] https://isaiprofitable.com/ - some of the green bars are creeping up a bit, but not much unless you count the shovel sellers

[2] sorry, leaking³

[3] Though it could of course be incompetence rather than malice, a mistake they are not actually making anything out of, as per Grey's amendment⁴ to Hanlon's razor.

[4] Any sufficiently advanced incompetence is indistinguishable from malice.