The website doesn't seem to mention anywhere that it's from ByteDance?
Also from the terms of service:
"You hereby grant to us, our affiliates and our third party partners (“SPRING Parties”) an unconditional, irrevocable, non-exclusive, royalty-free, sublicensable, transferable, perpetual and worldwide license, to reproduce, use, and modify Your Content in connection with the provision and improvement of the Services and its underlying technologies, as well as for the SPRING Parties' respective business operations, in each case, to the extent permitted by applicable laws."
Also from the terms of service:
"You hereby grant to us, our affiliates and our third party partners (“SPRING Parties”) an unconditional, irrevocable, non-exclusive, royalty-free, sublicensable, transferable, perpetual and worldwide license, to reproduce, use, and modify Your Content in connection with the provision and improvement of the Services and its underlying technologies, as well as for the SPRING Parties' respective business operations, in each case, to the extent permitted by applicable laws."