But I see in this a certain cognitive activity, only with poorly formulated goals. For example, you play in order to understand the laws of the game over time and learn to win more often.
Or maybe entertainment for you is something else?
Everyone will have a different opinion regarding this but I think my opinion as far as entertainment is concern seems to be the same with Wikipedia. Entertainment in gambling to me is when one engage in gambling for pleasure, fun and to pass time. When one is gambling responsibly with a reasonable amount of money when they feel to gamble, enjoy the moment regardless of whether they win or lose that money, they are gambling for entertainment. However, you hardly find people who gamble purely for entertainment purpose, some few people exist but the majority are in for another reason entirely.
Yeah, no one can force anyone to gamble for fun or entertainment, everyone is entitled gamble based on what they believe of it but it's very necessary for us face the reality about gambling. Having another reason aside entertainment is unrealistic, gambling for profit per se is the most unrealistic reason for gambling because only few percentage of people make profits from it, the rest end up being disappointed and frustrated which in one or the other affect everyone in the society. It becomes necessary to continue cautioning people to gamble for fun and not profits.