I don't think it is safe to entrust your money with Mercury until the issue of an malicious SE stealing your money is addressed.
I never asked anyone to send bitcoin to any service, there was testnet and you could test how it works, not just speak in theory after few minutes of reading docs.You can do as you like, but I also don't trust anything you say and I have your reputation to back me up on that
I also think it is strange that you are promoting something originally posted by a one-post newbie
Every centralized service that holds custody of your bitcoin says that you can withdraw at any time. So did most ponzis before they imploded.
I also think that Catena XXX and other defi stuff that you are advertising is also centralized junk that only have decentralized label.Hope you also checked their ''documentation'' as well... sounds almost like a very visionary