"But senators, we can't break up these three unrelated services because they all use the same messaging infrastructure!"
I laughed at this because I thought the same thing. Conspiratorial or no, that line of argument won't fly. Saying everything is so integrated that it can't possibly be decentralized is basically proof of monopoly.
[0] https://ec.europa.eu/commission/presscorner/detail/pl/IP_17_...