Kraken can randomly return any coin to you if you use Opt-In Rewards

Kraken does not allow my post in their own subs. Apparently, they don't want to be asked uncomfortable questions.

Kraken is adjusting its terms and conditions for opt-in rewards to ensure that they are not obligated to return the coins you provided them for the opt-in rewards. This means that if you provide BTC or ETH, for example, you may receive Shiba-inu-bonk-fluffly-coin back later when you remove it from the opt-in rewards.

They will probably say that this will only be the case in certain edge case scenarios, and that is probably true. But until this is officially clarified in the fine print, it's just “trust me bro.”

Furthermore, I find such small but subtle changes to the massive disadvantage of customers very concerning. I think now that Kraken is heading for an IPO, the winds are changing.