How does Skype vulnerabilities repaired

The article is emotional and length so here is TLDR:

There are several methods how your skype account can be disabled permanently by an attacker. Some of them have been known for a long time. Russian social network (vk.com) has tens of groups, consisting mostly of teens, who do so for fun or for money ($30 per account. Author tested one of "services" and it work). Microsoft does not fix these vulnerabilities for many years and recovering account almost imposible (Microsoft's support does not reacts on any evidences and gives formal replies to attack victims)