Discord has made a decision to limit the stickers to Nitro users. And Discord servers that has Level 1 boost, will be able to upload custom stickers in the near future.

Discord's message

The stickers are still restricted to Brazil, Canada, and Japan, and hasn't been released worldwide. Though this restriction can be bypassed by typing something in the message box. For example type ":happy" and it will show Smiling sticker on the bottom. Another example is :mad, it would show Angry sticker on the bottom

This one for example

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