If you use Signal, Discord, or any other messaging app and you DON'T want Google or Apple monitoring/reading/learning from your messages, follow these steps.

Android:
1. Open Google app
2. Tap your profile photo
3. Settings
4. Google Assistant
5. "Your Apps"
6. Choose the app (e.g., Signal)
7. Toggle "Let your assistant learn from this app" off

iPhone:
1. Settings
2. Apps
3. Choose the app (e.g., Signal)
4. Toggle Apple intelligence or Siri settings to off (“learn from this app”)

Note that your Android instructions may differ depending on your model. Those worked for my Pixel, but please feel free to chime in with directions for other models.
@EnfysBook Wow, I've been on GrapheneOS for a while and didn't know that the Google Assistant app was doing this now. That's absolutely insane.
@alisynthesis @EnfysBook totally insane - though not surprising - and you can't just disable google assistant all together or toggle the setting off for all apps - they've made it cumbersome do to it ... argh

@doktorlond @EnfysBook graphene is really great!

Edit: you have to have a pixel to use it.

@alisynthesis @EnfysBook I've been dreaming about a de-googled phone for long - but in denmark it's not so easy because so much authorisation is bound up on ios and android specific apps - all kinds of interaction with authorities and banking and getting messages from your kids school and and and ... I just spoke to a neighbor who had to skip it and buy a standard android because one of these apps we not running - it's really mad - big tech must love the danish goverment!
@doktorlond @alisynthesis @EnfysBook I installed LineageOS with microG on my Fairphone 4 the other day and the only problem I haven't solved so far is with in-app purchases. Banking app (Merkur) and MobilePay works just fine. I don't use any of the government apps, so can't say whether they would work. But I'm generally quite impressed with how few problems I have.

@decibyte @doktorlond @alisynthesis @EnfysBook
I ran Lineage for a few years and it's definitely better than stock android, but I recently switched to Graphene. It's on a whole other level for security.

It was also the easiest install I've ever done... Once you unlock "developer mode" you just load up the Graphene website on another machine, plug in your phone, and the site basically does the install for you.

Seriously, highly recommended.

@TheGreatLlama @doktorlond @alisynthesis @EnfysBook I would absolutely have gone for Graphene if it would run on my Fairphone!
@decibyte @doktorlond @alisynthesis @EnfysBook
Yeah, that's the one downside. I can say, having tried it, my next phone will ALSO be a Pixel running Graphene.