If you are in the EU (I’m not), they have given you the DMA. Google is a gatekeeper, and some API’s are anti competitive, like this. Join St Max doing God’s work.
Also think of Article 11 of the ECHR which protects “freedom of association”
An unconsidered aspect of that is that in the tech era you are being compelled to associate with both foreign corporations, and the govt’s whose security laws they must obey. The ECHR probably only bears on the State compelling you, not private actors. It might however be used e.g. to stop a govt dept from exclusively distributing it’s apps on Play store and IoS only.
I am currently using this argument to stop my (state funded) university forcing me to agree to a contract with the Turnitin anti-cheating service as a condition of submitting assignments.