These websites are basically safe, because they are all regular third-party sales organizations, have been strictly examined and approved by the CSRC, and are supervised by the CSRC. Basically, there will be no problems, and problems will be properly solved.
In addition, don't worry about money at all. Funds are kept by special bank accounts, and after being converted into funds, they become fund assets, and it doesn't matter who sells them. Even if the organization goes bankrupt, you can find another sales organization to redeem it, but it is a little troublesome, and the funds will never be less, no matter who sells it.
If you don't understand, sincerely welcome questions; If I am lucky enough to help you, please adopt in time! thank you