I think they can choke on stickers, they have no legal basis. It's a scare tactic. If you're still worried, most stickers can be easily removed especially when heated up and put on something such as rough plastic so they are easy to remove and reapply later. Or put them on a thin plastic foil, like a clear thin bag, then cut sticker out and glue it back on the card if wanted.
It's one damn good card anyway, jelly.