how is the Guernsey marine network bill-shock situation able to persist?

When people cross to and from Guernsey on the ferry, their phones can latch on to  a marine network, which gets charged at ludicrous per-MB rates.  How can this situation persist?

As far as I can tell, the rogue network(s) are transceiving from elsewhere on the sea, not from onboard the ferry. 

Condor Ferries warn about it as part of their standard announcement.  I have received warning messages about it from the home network of the phone I was taking, I think Sure, but it could have been JT.  The implication from this was that the home network was not "in on it".  This does seem dubious, as they have got to be in control of their own roaming agreements.

If we accept that the home network is not in on it, then we have a strange situation, where a roaming scam is happening, but none of (i) the customer, (ii) the home network, nor (iii) the ferry operator want it to be happening.  What gives?  I suspect the home network is in on it, but I could be wrong.

update: the screens on the Condor ferry describe it as a "satellite maritime" network.  The plot thickens.  Most phones can not talk data to satellites directly at this point, so there is a gateway involved, and "satellite maritime" may be misdirection.

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