> Their value is only in being 'the other guy', not in actually creating a valuable product for consumers

Mozilla's value to Google might be only being "the other guy", but Mozilla is valuable to me (a consumer) because they are producing a Firefox, which is a product I consider valuable.

Obviously I would prefer that Mozilla can find a self-sustainable business model to support Firefox development. But if I had to choose between "Mozilla doesn't exist" and "Mozilla exists only because it gets money from Google", then I choose the latter.