You should never leave coins on any pool, no matter how much you trust or believe in the pool. Leaving coins on a pool is exposing yourself to unnecessary risk.
The pattern you are seeing with pools going down has nothing to do with any kind of conspiracy or ill intentions, it is simply a lack of motivation for pool operators to pay enough attention and devote enough time to keeping their pools running properly. Pools require some degree of maintenance and upkeep, and when there isn't much profit motive to do it then people stop doing it and pools go down.
DuckPond.io is committed to DUCK, we believe that in a couple months each DUCK will approach $1,000,000. We are in this to win and we are not bailing out when DUCK has only actualized 0.5% of its potential. Come join our pool, we won't let you down. There may be bumps along the way, sure, but we will stay the course. Our pool has been running nice and smooth for weeks now

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