Not really. It's still a free choice. Many allies have saved a lot of their military expenditures after 1990. The NATO is not a one-way alliance. The alliance members have the same obligations - but some governments/parliaments chose to keep expenditures high.
Alliances are usually understood as lowering the need for defense expenditures. To believe that the opposite is true seems to require somee kind of political brainwashing in my opinion.
I've herd this subsidizing idea before (and it is somehow true), but it's still a free choice, and nothing that could be blamed on partners. I doubt that Taiwan could force the U.S. to have more than three CVBGs, for example.
Most of the U.S. military power is in fact excess power - European forces are strong enough to protect Europe, South Korea is superior to North Korea, Australia, Taiwan and Japan can take care of themselves with their strong economies and island geography as well.
In fact I cannot think of any alliance conflict that would require any U.S. forces at this time.
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