If this is passed, would this only apply to people in France? Like Signal and WhatsApp, etc, could they make a different version of the app / backend that's unencrypted just for them? Is that even possible? I can't imagine Signal adding a backdoor for everyone in the world.
Or would they just outright pull their software / apps from being used in France? But then what's stopping someone in France from sideloading the app and using a VPN?
If you are up for some self-hosting, pi-hole can block some ads, and whatever domain names you'd like. Just have to set your device's DNS to its IP address. Some ads will get through but it can block a large amount of them.
For android on a per app basis, I use the pro version of NetGuard to block some apps from connecting to ad and tracking domains, or if an app has no good reason to connect to Facebook, etc.
If you have a pixel android phone, GrapheneOS is a great OS to limit what data is sent off to Google.