Often meet on any message boards wholesale SIM cards of local operators, which are sold after use to check-in to popular systems message exchange (Telegram, Viber) and social networks . Ukraine SIM cards are sold freely.
Also, now the Internet is services for the sale of virtual SIM cards, many of which are used for temporary registration bots, especially for services that allow you to register multiple accounts on 1 phone number.
But it will all net accounts after registration, never been used.
Maybe someone will create a legend for each account and fabricate personal data + photos with some algorithms, but many do not do so.
Sometimes these accounts can buy companies for their own marketing campaigns or internal needs. But often these are not very honest people.
Clean accounts without the bad publicity will be expensive.
And so there will always be viruses, keyloggers, weak passwords, merged database due to which many users and lose their accounts. Then this information will be somewhere on display for sale.