Read up on history. You have this completely backwards. It took many years of government intervention to force them to open their networks. And in some countries banks still don’t interoperate or charge obscene rates for it.

I have nothing backwards because I said nothing about cause and effect, you appear to have fabricated some historical error about regulation so you could have something to condescend to me about. But even so, regulators did not invent cross-network calls nor did they invent inter-bank transfers. Both of these industries had those things prior to regulatory mandates and went through "wild west" periods that have clear parallels to the fediverse today (the early 1900s for telephones and the 17th century for banks) when interoperation existed but was quite selective. My point was that mature federated ecosystems converge on valuing connectivity very highly, and the fact that this value was so clear in these two cases that it was eventually encoded in law supports rather than refutes that claim.