I would note that Facebook and Google were opposed to eg gdpr although it gave them a larger share of the pie.

When framed like that: why be opposed, it hurts your competition? The answer is something like: it shrinks the pie or reduces the growth rate, and that's bad (for them and others)

The economics of this bill aren't clear to me (how large of a fine would Google/Microsoft pay in expectation within the next ten years?), but they maybe also aren't clear to Google/Microsoft (and that alone could be a reason to oppose)

Many of the ai safety crowd were very supportive, and I would recommend reading Zvi's writing on it if you want their take