Selling and buying account is clearly prohibited. Youtube does not care about any purchase proofs as they are illegal, so owner may return "sold" account if really decide so. Violation of selling account was confirmed numerous times by badged support forum members and youtube employees. In some cases resold channels were suspend for that when it was discovered, like in complains to support about losing access to channel they bought. ISPs do not care about Youtube's terms as none of them agreed and signed them All Terms of service are same for all languages and countries. Country laws are irrelevant as Youtube has no obligation to provide you free service and may suspend you for any violation or even without any.