It's been extensively reported on, and any AWS user that clicks on the health dashboard would also have seen it, even if they don't consume from news outlets.

As for use it gets: plenty of use, mostly when someone needs to have their worlds close to that area (usually latency or legal reasons). There are a lot of smaller businesses that lost a lot (or maybe even everything) because their never thought they would need to create backups in a different region. Most of that wasn't really reported on but instead gets shared on various platforms like Reddit.

The only reason we knew about it is that it was one of our network output 'node', but I don't think I've read anything about it in generalist medias

Are you implying that something that gets reported on, shouldn't be on HN? Also, clearly it wasn't that extensive if GP hadn't heard about it