There's literally no reason you as a man should partake in abstaining from ejaculation for 30 days, it not only fucks up your hormones there's no long term studies to say if it's healthy for both mental health or health in general.

Men already have low T in our culture, don't add to it by being a dumbass and following some internet trend started by 4chan.

In both men and women, testosterone levels were highest after intercourse. Levels were lower before sex and on days with no intercourse. These results suggest that sexual activity influences testosterone rather than testosterone influencing sexual activity.

https://www.medicalnewstoday.com/articles/325418#short-and-long-term-effects

One 2001 studyTrusted Source of 10 adult males did find that refraining from masturbation for 3 weeks may cause a mild increase in T levels.

https://www.healthline.com/health/masturbation-and-testosterone#research

And this also takes away support and conversations for Movember an actual movement to support prostate cancer in men.

https://ca.movember.com/

This actually goes against the studies found between healthy prostate health and ejaculation:

In all, men who averaged 4.6–7 ejaculations a week were 36% less likely to be diagnosed with prostate cancer before the age of 70 than men who ejaculated less than 2.3 times a week on average.

https://www.health.harvard.edu/mens-health/ejaculation_frequency_and_prostate_cancer

EDIT:

First of all, I'm not just talking about masturbation and porn, those are two different things to NNN. That for some reason some men are using it as an argument to support NNN. Since a lot of you guys want to claim that Porn leads to ED, here's proof that it doesn't, but again that's not what this post is about.

"Our study, and now two others, have found there is no relationship between the amount of sex films men view and erectile functioning with their partner,” says Nicole Prause, PhD, a sexual psychophysiologist and licensed psychologist at the Sexual Psychophysiology and Affective Neuroscience Laboratory. Her research with Jim Pfaus, PhD, IF, was published in Sexual Medicine and was the first peer-reviewed study of this topic."

https://www.healthline.com/health/erectile-dysfunction/porn-induced-ed#sexual-anorexia