Earlier quoted context omitted.
There's a ton of reasons to not use Messenger. 1. The mandatory "seen" indicator 2. All of your messages are beholden to a private company, permanently stored in plaintext 3. They analyze said messages to deliver advertisements. Seriously, one time I mentioned buying a Samsung SSD to my friend in chat, and all of a sudden I got a ton of SSD advertisements on the sidebar. Same thing when I mentioned Rick and Morty. 4.…
Most of these sound like reasons not to use Facebook in general. While the seen indicator is a legitimate annoyance, it's been commonplace for some years now. I don't know of a modern chat app that doesn't have it. As for the rest of your points, Facebook's money comes from ads. These concerns are not limited to chat, but using Facebook in general. As you browse the web, Facebook is tracking you and using the data to…
I don't use those either. I stick to texting and iMessage.
> The point of using Messenger is that you're not tied to any other portion of Facebook.
You're tied to their ad platform. Whether you view those ads or not are up to you; but you are nonetheless tied to it. They analyze your private conversations with the eventual hope to manipulate you.