I certainly expect the HR heads of the big tech companies know each other and talk now and then. Even if they're not colluding in some illegal way, I'd actually be a bit surprised if they weren't discussing COVID-related matters.
To be honest, I’d be way more pissed if my HR and Facilities teams weren’t talking to their peers in the industry and sharing learning/best practices throughout all this.
There's no need to collude when you can just notice how the wind is flowing; expect a flood of these announcements over the next weeks.
Apple didn't just decide to do it because Google did, they'd already decided it was coming, and perhaps moved up the announcement now that someone (Putin? Google?) took the news cycle.