This should 100% be a user option, since it ruins compact mode (also while we're at it, please make non-previewable files look nicer in compact mode), and maybe a server option, since stickers are generally annoying for me personally (basically paid non-copiable gifs). Here's a quick mock-up of what it could look like in role settings:
Please, Discord. You have added an option for when stickers animate before you added an option to disable this. Compact mode is literally treated as a joke, with most things designed for cozy mode. For me, as an IRC user, this is just sad. Please add this.
Edit: I am genuinely considering rolling back to an older Android version that doesn't have stickers.
Edit 2: Custom Stickers are now a thing. The "Use External Stickers" permission is being worked on and is rolling out to servers. I now have my own bot to delete all sticker messages, however this is still an issue as people don't have the knowledge to create their own bots, plus bots can go down or restart.