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They must have valid reasons for doing so. After all Bittrex earns when people trade and not by delisting coins

Nope, not necessary, they could have shady reasons too ;-) And there is nothing wrong at all with Metal... they simply do not want to support their competition LOL. Metal will go up without Bittrex too ;-) Check it up: https://steemit.com/crypto-news/@cryptoclick/breaking-news-re-metal-token-developments

if they have decided to delist a coin it is more then likely because the team behind the coin is either having trouble or doing something shady.

After this discharge from the big platform, it is very likely that these currencies will fall to large levels
This may have a great impact on those who continue in it, so the currency team must intervene to find solutions

What will happend to my coins, if I don´t sell them and they will be delisted? Do I lose it?

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