There is no one answer to this question as the legality of poker tournaments can vary from country to country. In the United States, most poker tournaments are considered legal as long as there is a cash prize and no other forms of gambling are taking place.
However, in some countries, such as Spain and Italy, poker tournaments can be considered illegal gambling activities. As such, it is important to check with your local authorities before participating in a poker tournament.
The conclusion to this article is that while most poker tournaments are legal, it is always important to check with your local authorities before participating in a tournament.
