That given, they are not going to "waste" their canary if it was a simple request for information. Best guess, this is the beginning of the end for Ethereum and they have been compromised just like Blockstream and BitcoinCore were previously.
It is best to assume that from now on Ethereum is no long a decentralized application but its development is being directed by a governmental agency, again, same as BitcoinCore.
Most important next step for Cryptocurrency is to make it development resistance. Every notable attack on crypo the last few years has not been hackers but developers like Greg Maxwell, Peter Todd and Adam Back who attack the code base out in the open, acting as useful idiots for three letter organizations. It seems ETH is next on the chopping block.