Idk if this is considered piracy since the discord stickers were just made free but I personally appreciate the freedom to repost the stickers on other platforms

Find the url source of the sticker, either use view source CTRL-F for “passthrough” or if you have a “sources” tab in your f12 debugger go to >media.discordapp.com/stickers to find all the stickers currently loaded on the page there. If you see animated files here download them (they will be in apng format just convert them to gif) but if you see still images take the url and replace passthrough=false to passthrough=true and then dl that and again convert from apng to gif