That is unheard of in Europe, so makes no sense to you - hence the confusion.
It's also often the case that prepaid plans or smaller carriers in the USA don't offer international roaming.
So if I buy 10.000 SMS for cheap on Messagebird I can "denial of service" your phone bill?
What, lol?
>> Some of the comments pointed out that this is hostile behaviour for people roaming as well
> I’m sorry how is this related to roaming?
That is unheard of in Europe, so makes no sense to you - hence the confusion.
It's also often the case that prepaid plans or smaller carriers in the USA don't offer international roaming.