From my perspective, trading bitcoins or altcoins can be considered as gambling, with a much lower level of risk, of course. When i trade i'm researching coins same as some sports gambler research football teams. In both cases it's gamble if you don't have some reliable insider info..
You are right with it and I would say that not just trading is going to be considered as gambling but all types of investments are good to consider that they are all types of gambling.
Because you are going to risk your money or bitcoin in able to make grow of it. We are just like the same as gamblers if you a trader.
They are gambling for the aim of growing their bitcoins fast and you are also do.