I can't recall, but - didn't the Destiny 2 PC Beta have in the Option menu a option to display the framerate in-game?
You know, if Destiny 2's dev/publisher wants to ban players using 3rd party app's like MSI Afterburner or RivaTuner and other stuff like Discord, they really should warn PC gamers ahead of time about this. We normally like this stuff running to let us know how well or poorly things are performing.
And of course, if they are going to ban over this non-sense - well, then these tools should already be built in-full in Battle.Net and/or Destiny 2 to be able to display heat temps on GPU/CPU/whatever else; display framerates, RAM usage, VRAM usage; use your own framerate limiting caps; and other stuff - since PC gamers like having this stuff going to know how their system's handling the game & performing.
The last thing I - or anyone else, for that matter - needs is Destiny 2 maybe heating up to say 100 degrees Celsius on say my gaming laptop; I would like to know if this was happening so I can limit my GPU/CPU or something so I don't let my laptop turn into burnt toast, you know?
I know I normally like running MSI Afterburner and other tools, when running most PC games. Good thing I normally do Single-Player games, since I doubt I'll get a ban for using that stuff in SP-based games. I guess w/ MP-based games, we're going to have to be prepared for this non-sense of banning 3rd party app's and maybe try not to use them on anything modern.