That doesn't really square with the evidence though. I mean, the points you cite are in fact arguments in this case, and I agree they're interesting legal arguments. But they don't explain why the case was brought.

I think it's reasonably clear that the plaintiffs here (not the ones in the original suit!) don't really care about whether or not millions of Google users get compensated a few dollars. What the plaintiffs want is a broad SCOTUS precedent putting a new requirement on class action settlements, and thus making future class action cases harder (i.e. more expensive, more risky) to pursue.