@ploum With *astonishing* chutzpah, one reason they gave for this was that Usenet had too much spam.
It's hard to interpret this sequence of events as anything but an "embrace, extend, extinguish" strategy, or at the very least an appalling disregard for the very concept of being a competently-run, responsible part of the global Internet.
If Google turns up on the Fediverse, their past form shows that it would be very unwise to believe they're participating in good faith.