Ma Bell wasn't created naturally at all. It's monopoly status was granted by the federal government. This is fundamentally different from Facebook, Amazon, etc. If anything, the large ISPs like ATT, Verizon, and Spectrum should be looked at, but solving the problems of ISP monopolization will take a lot more than just breaking up territorial monopolies into smaller territorial monopolies.

That's a different failure. The government should have never allowed for the subsequent mergers.

The US also broke up Ma Bell in 1956, forcing the spinoff of Bell Canada and Caribbean operations, and before that in 1925, breaking off other international operations into ITT.

Imagine how much of a larger monopoly they would be now if they were never broken up in the first place.