I think that is exactly what they mean, Google abuse/subverting the floss ecosystem creating a de facto closed system, and would have to open up to be a really open source OS if they want to get exempt. Same with apple and the BSD kernel and base (although it can be said that they are not subverting the spirit of the code they use since BSD licenses ate by design made to allow closing the source, etc).

In any case I am pretty confident that all big tech want to eagerly embrace age verification since it is another data point to sell and for their ad machinery.