To give some of the news. Facebook enabling e2ee in messenger so they don’t need to monitor it. Also google who did the same thing for location history lately. They are all using it now to doge law enforcement and the costs of that.
On the other side we see all companies am wanting access to all your documents to train their AI Microsoft. Once the AI is trained it works well and local models can even have trained context. But they need data to improve the quality and analysis. The last part is the scary part where a lot can go wrong, goes wrong and will go wrong. And of course the fact that your data can be reproduced by AI when asked.
I am not sure how notion’ implementation works but I doubt it runs locally.