Most of these guys are scammers. If you really need a wechat account, just get register w virtual number then find someone with wechat to scan the QR. If you really can't help yourself, then be sure to use a middle-man!!!
Like parasites, scammers feed on desperation and hope. Scammers desensitize people in feeling genuine empathy for others. The only way to stop scammers is to realize there are other options available. When people get desperate, they take risks. But when people really stop and think, they will discover that by waiting, time will reveal new and better options.