Wouldn't it be simpler for facebook and for its users if they just implemented some sort of "FB Pay" equivalent to WeChat Pay that's tied to their messenger app

Wouldn't it be simpler for facebook and for its users if they just implemented some sort of "FB Pay" equivalent to WeChat Pay that's tied to their messenger app and be done with it? I'm definitely missing a lot here as I haven't kept up with the latest libra updates but I seriously fail to see why making or calling this a cryptocurrency is the way they chose to go although I'm pretty sure there's a fair amount of greed and powerplay behind this. Tbh, it is starting to sound a lot like some sort of real world e-coin that is tied to some of the least privacy concerned corporations, banks and governments and with none of the advantages of an actual decentralized cryptocurrency. It looks as it will basically be just an analogous to marked dollar bills but with easier digital traceability? Or am I going too much into conspiracy theory territory?