Telegram account is connected with phone number so you can easily take your account back after you sold. Beside I think it's not difficult to create huge amount of telegram account, you just need to buy a lot of trash sim card with very cheap price then you can create tons of telegram account or you just need to ask your friend to create it for you
. In my country, there are a lot of phone number renting services, with only 1$ I can create more than 20 telegram accounts. LOL
Try, you will not succeed. Do not forget about the SMS confirmation.
I sell accounts registered so that telegram do not ask for sms at the entrance.
You did not face the problem of lack of accounts. Now many ICO for registration require a unique login telegram and certain actions from it.