If a service cannot be offered at a certain scale without such practices, it should not be offered at that scale. Before you start talking about how this enabled google's innovations, remember that the path we have taken to our current innovations is not the only path that could have been taken. By correctly squashing out immoral avenues like today's ad tech, we lay the path for the same innovations to happen taking a different, more ethical path. Sure, it could be that that would take more time and certain innovations would be delayed by an entire era[1], but note that we could also be going 5x faster than today w.r.t TPUs or whatever if we enslaved and forced enough people to work for Google's ML infrastructure team and nobody/nothing else. But we don't do that, do we?
[1] on the flip side, certain innovations may also come an era early