from my opinion, if you say about risk, maybe its not just trading or gambling that is risky, maybe living in this world has risks.
next you say gamblers bet all their money in games where the outcome of the bet is unknown but what about sports betting as you said, is not that one type of betting? and if you compare with trade, do you only compare overall?
there are still a lot of deviations but I will say in conclusion that gambling is different from trading and if you say about risk yes you are right but you have to remember in trading there are 2 choices between short term and long term and on the one hand you bet $ 100 and lose on gambling at once you lose your money, but for trading, especially bitcoin, even though it is short term or long term, you still dont lose all the money you have.
trading is not gambling and is not the same as both have different risks and levels of luck.
The trading also had the risk as like the gambling,if you are the trader who doing cryptocurrency.Then you may come to know more about the gambling based on the cryptocurrency.When the market of the cryptocurrency like bitcoin,Ethereum and ripple was in the high value same was reflected in the gambling based on this coin.The net profit at the pump market will be more,So the trader will try to use the dollars which he get as the profit can be used in the gambling sites.So it’s easy to multiple when the tactics used by the gambler was matched and give more profit for the gambler who had their own tactics in the gambling based on bitcoin.