we do know the number was 1B in 2014 when oracle blurted it out in court.
We know Mozilla's numbers for a similar type of deal from that era and now. We also how market share and absolute devices have trended from 2014 to now.
Apple' s dominance in mobile and mobile as platform having a larger impact on search then web.
Putting it altogether 8-12B is a fair estimate.
To see it another way, if google is ready to pay mozilla $500 M / year with a browser in single digit market share and predominant presence only in web, 20x to apple is pretty easy
The house report says they don't know how much Google pays and they pulled the numbers from a story on the web that was guessing.
So as of right now no one knows what the revenue or profit is.