An exodus of support from Facebook’s proposed crypto-currency initiative, Libra, is threatening its credibility while a report by the G7 says Libra must not be launched until safety measures have been demonstrated.

Mastercard, Visa, PayPal, eBay, Stripe and Mercado Pago have all pulled out.

That leaves from the original list of participating partners: PayU, Farfetch, Lyft, Spotify, Uber, Iliad SA, Vodafone, Anchorage, Bison Trails, Coinbase, Xapo, Creative Destruction Lab, Kiva, Mercy Corps and Women’s World Banking along with VC backers Andreessen Horowitz, Breakthrough Initiatives, Ribbit Capital, Thrive Capital and Union Square Ventures.

“Visa has decided not to join the Libra Association at this time,” says Visa, “we will continue to evaluate and our ultimate decision will be determined by a number of factors, including the Association’s ability to fully satisfy all requisite regulatory expectations.”

Facebook plans to announce the initial membership names today and to launch the currency in June next year.

Germany and France say it will be banned in Europe.

The US Federal Reserve has expressed reservations.