Yes, I have gained from trading but I had also been among losers at times in the past. Overall, I must say that I am in profit but that is only because I have traded more in BTC than in altcoins and since the price jumped, I didn't had to do much.
I think the biggest factor behind such devastating stats is the bogus strategies people use and sometimes being too greedy, especially in the altcoins market when they hold tokens which are slowly dying.
People who experience losses during a bull market run like this are usually newbies who are just entering the market, are too greedy or buy shitcoin which is also the cause of quite a lot of losses.
Profits and losses are common, this is free trade. All risks are at our own responsibility.