Personally, I don't recommend the tournament.

At first, I understood having an ad pop up every one or two games, but the more I play, the more ads appear after every single match, regardless of whether I win or lose. This makes it really hard to catch up in the tournament because I'm struggling to close the gap... It even seems like there's no option to purchase an ad-free experience. If I want to avoid ads, I have to turn off my data or Wi-Fi, but then I can't earn gems, which is even more of a headache. Honestly, it might be better to just skip the tournament altogether if it's going to cause this much trouble.