Yo, disc strips most metadata but not all. If you’re concerned and want to be safe, use something like this: https://exifcleaner.com/
Or, ExifTool if you’re comfortable with command line.
Relevant tweet from Discord:
Heya! We do strip some data (EXIF geocoding data mostly) and run the images through our resizing player to hide your IP!
— Discord (@discord) January 30, 2018