360 company's browser currently occupies a huge market share in Mainland China, they have previously launched their own trust store.
I guess they deployed their own trust store because many people in Mainland China are unwilling to open Windows Update, and the 360 browser supports Windows XP so far.
Therefore, it is necessary for them to maintain a trust store.
But I don't like this company. WoSign and StartCom are subsidiaries of 360, which suffered major accidents.
Before it was acquired, StartCom's free SSL certificate and cheap code signing certificate were very affordable.
I put forward this proposal only considering that users can normally access websites that use Let's Encrypt certificates without updating the system. Although they should update the system.