Since I do not have a smartphone or a cell carrier, I only have a voip number, which most sites think is a fake number. As a result I often have to use these shady SMS verification services to get my own personal legitimate accounts open.
It's important to note that this is just Airbus's best guess as to the cause, as there's no smoking gun: they simply exhausted their troubleshooting and were left scratching their heads so this was the "least unlikely" cause they could come up with given the circumstances.
Seems like an attempt to enforce government ID identification and destroy online anonymity to «protect the children», the very same way it's been done in Britain.