Probably shouldn't reveal this but, Google are using it internally for their accelerated networking in their cloud, pretty much all Lanai hardware is deployed in GCP infrastructure.
We use Lanai elsewhere, and it's in hardware powering Google's server networking networking (inclusive of GCP), but Lanai sadly does not play a substantial role in Andromeda networking.
Feel free to ping me on corp (username in my profile here) to discuss.
I guess the only genuinely interesting question worth asking (and hoping for an answer to) is, given the back and forth about performance and Myrinet vs IB on here... how well does the design stack up in practice to an Ebit-scale environment?
There's also some more recent coverage on IPUs that I don't have a handy link to.