I don't think gambling is a means of relieving stress since it's pretty stressful lol.
Entertainment-wise, yes, but not all entertainment is a stress reliever... IMO gambling is more suitable for killing time or pastime. For example, you don't play difficult video games like Hollow Knight, Counter-Strike, or Dota to relieve your stress (except you're extremely good at it or play with bots for easy wins).
If you want to release your stress, just go to a massage parlor or spa for therapy.