We were that big company (50,000 employees, probably about 10,000 or so in technical roles across the enterprise) that had a bunch of custom portals and internal sites for all our dev stuff, and also Stoplight (Spotlight?) for APIs etc..
We were early adopters of Backstage, back in 2020. We've migrated almost all of our portals and "meta-infrastructure" to Backstage, and it's certainly not perfect, and not everyone has moved over, but the majority of our teams are in one service catalogue and people can much more easily find service owners, dependencies and more.
It's been a great tool and a pretty big internal success story for us.
But this move from Spotify tells me that they are no longer stewards of an open source project, they now use open source as a loss-leader for their paid offerings.
Which is totally fine, but it will change how we look at that relationship.