AFAIK, Libra network is something like XRP/Stellar. I expect collision between validations to be plausible.
But way more scammy and centralized. XRP/Stellar anyone can bring up a validator and anyone can pick which validators they use. For Libre, FB will own the validator list. Rent-seeking$
The central planners plan to decentralize... at an unspecified point in the future. After the crisis is over. After everything is well under (their) control. I've seen this movie.