Dropbox is testing AI tools—an experiment that involves OpenAI getting access to users' documents and files if you start futzing around with the AI tools. You can opt out by…
I’m totally in favor with your post, but not everyone is willing to self-host or is capable of doing it. So I recommendation would be and one that I’m currently using, is when uploading a file to these cloud services encrypt your files. I’m using #cryptomator, but I’m sure there are other alternatives, like #rclone. There is also #veracrypt, but to my understanding, is not great for cloud sync.
Cryptomator official website
Quick youtube video in how to use cryptomator (3:51)
Cryptomator is open source and free, but only on desktop. To use the mobile version, you will have to pay. Here is a list of alternatives to cryptomator, if you are familiar with one, please share your knowledge.
As is usual in these cases, this is not legal in the EU and they cannot "legally" do this. However they might still choose to take the risk or factor in the cost of litigation.