I'm also sure they would, but can this issue arise at all? I mean, if you lose your phone, you can get the same number for a new SIM card. I don't know about all countries, but in most places this works for for sure.
Yes it possible to get new sim card with the same number but some time the process is a bit complicated especially if the used number is not registered using our own personal information as it will be impossible to prove the ownership of the number. I just have no idea with the rule that it is not allowed to change phone number during 10 years.
I think after our conversation seen by Fortune Jack officials they will consider changing this rule. But I understand that it is not so easy as it may seem. Allowing to change phone number can put users of the site at additional risk, so something has to be invented to work as a substitute, to maintain the security on the same level.
For example Bitinity said above that his phone number registered there is not working anymore since several years.