Of course, Amazon wanted this to happen.
They own 20% of Anthropic.
Anthropic bleeds cash. They have to raise capital.
There are only 2 ways: an IPO or follow-ons from existing investors.
If the IPO gets delayed because of these restrictions, Anthropic will be forced to raise more capital from existing investors.
And existing investors (Amazon) will end up owning more of Anthropic at a cheaper valuation.
Why would they have launched Fable on Bedrock if they knew they were going to be shutting it down a day later?
There's a much simpler explanation: Amazon's business is selling cloud services. Amazon is constantly under threat of attack and anything that disturbs the balance between attackers and defenders is bad for Amazon. Amazon also needs to keep their AWS customers safe.
This is Amazon prioritizing their 100% stake in AWS over their 20% stake in Anthropic. It's also possible that Amazon knows things that are not public.
The fact that Amazon is willing to report this despite owning shares in Anthropic and being close to a liquidation event points to whatever they found being actually serious.