There are no free stickers or even prints! Once you click on "Anywhere else...", select a language and click "Print these..." you get redirected to Stickermule where you either have to pay for or when you chose "templates" you'll get the message "bitcoin.rock hasn't added anything yet". Unless I missed something your claim isn't true.

Those my custom slippers count? 😂🔥🔥

The StickerMule store is just for buying directly from StickerMule so you don't have to upload the files and dimensions yourself. On the sticker file pages just right click save the sticker images.