1. They are not created for long term most of the time shitcoins exist for short term and devs who create it will dump this because they move to their next project to avoid losing your money sell it immediately once you are in profit.
SHIBA have been proven to survive for a bit long time even though it's called memecoin. There will be one or two of them that has this behavior, it doesn't matter anyway because it's still called memecoin and the only thing that they get recognized is through hype and engagement from the influencers, some of the memecoins survive because of the community.
2. Never believe about devs promises since they are not really there to help you but they want to scam people and want o get rich quickly.
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The only thing that matters because they live up with the meme they are chasing for, for easy hype stuff. I don't really believe they would apply it in real world because of the behavior of this type of asset.
4. Never believe on people telling you to hold or even buy more they just want their target to get hit and for sure they will dump it without your knowledge so sell first before other do so that you will not end up chasing pumps to gain back your capital.
It's not limited to memecoins only but any altcoins you can find out there. Be careful with every suggestions you get in the internet.