The source and setting of this proposal is still unknown. It appears to be specially crafted to fit only the biggest US software companies, there is only a bit over a handful that fit the defined criteria.
There is a hearing about Libra to happen on 16/7 (tomorrow) and a US house of representatives financial committee meeting to happen on the 17/7. So I think this week we will conclude with better information on this case.
As proposed I would say it is neutral to Nash (possibly positive given that if the space is constrained to startups the trading activity and volatility might be significantly higher) and positive to current networks as they might enjoy less competition from those giants.
Thanks Fabio, let us know more when the dust settles