@Kerasit
Unfortunately, IPv4 addresses are distributed very unfairly around the world. The fact that one often loses one’s IPv4 address when the contract is changed is not really comprehensible and should not be at least for those users who would like to keep a real IPv4 address.
Where the real reason is that a pure IPv6 network does not work. Many companies still use only IPv4 on their proxy systems. And then you are simply unreachable without IPv4 or a tunnel to your home.
Many people here now have fiber optics, which means they have a poorer connection than before. They also often pay for bandwidth that they never use anyway.