Indeed. A Google engineer stated on Twitter [0] that the shutdown of the service happened because apparently YOLO is only supposed to be accessible to whitelisted partners.
[0]: https://twitter.com/sirdarckcat/status/994867632355577862
[0]: https://twitter.com/sirdarckcat/status/994867632355577862
I'm sure that will go down just fine. FB just got into a lot of trouble over something like that (arguably a lot more serious, but still).
This is seriously denting my continued belief in Google's security chops. I know they have some of the finest security researchers on the planet but this was handled in a ham-fisted and ineffective way so far.
And best of all: without 'partner' status you won't be able to check if has been fixed.
This is a great demonstration how a company can have all of the right talent but still manage to become incompetent through poor organizational policies.