their T&C mentions them as "SPRING (SG) PTE. LTD"

singapore business directory: https://www.sgpbusiness.com/company/Spring-Sg-Pte-Ltd

hard to tell if they are indeed Bytedance. but given Bytedance and Tencent has HUGE Singapore HQ and notorious status of SG being a proxy for China, I would not be surprised if this is indeed Bytedance in disguise