From a legal standpoint, using a third-party tool to unlock your bootloader is generally a gray area. While it is not typically illegal for you to modify your own purchased device, it is a direct violation of the manufacturer's terms of service. By doing so, you are voluntarily forfeiting your warranty. Furthermore, using such tools to bypass security features like FRP locks on a device you do not own would be illegal in most jurisdictions.
Compatible with a wide range of devices from these brands. Smt Bootloader Unlock Tool
SMT Bootloader Unlock Tool: The Ultimate Guide to Modding MediaTek Devices From a legal standpoint, using a third-party tool
Using non-official tools like SMT comes with significant security and hardware risks: From a legal standpoint