> Everything that turns into a monopoly should be nationalized instead.
I don't think it even needs to be a monopoly there are services that makes no sense to have companies competing to provide them.
Most utilities fall under this
Don't get me started on water in the UK.
It's private and you get no choice of supplier, how this is not a national scandal i don't know. At least with Gas/Electricity/Broadband (Excluding virgin from this) at least there is competition if delivered through the same means.
More controversially, post/parcel delivery could likely benefit from being a single company IF run properly, big if, I know.