Nonini shared a letter signed by MCSK CEO Ezekiel Mutua confirming he is no longer a member of the body on his social media platforms.
In the letter, it was clear that he applied to terminate his membership with MCSK in February this year.
The termination came into effect on May 18.
Nonini said it was time he moves to something that works better for him.
"We need to take affirmative actions like this one. We have the power," he wrote.
"Insanity is doing the same thing over and over and expecting different results. Moving on to something that actually works."
The artiste relocated to the US during the Covid-19 pandemic and has been selling branded merchandise, including shoes and hoodies.
In a different post, Nonini said change is the only thing that can bring better leadership.
"The human society is the extension of the individual," he wrote.
"If we really want a radical change in anything, if we want a better world, better leadership and better structures.
"We need to change the things that are not working by understanding you have the power individually. It starts with one person."
Insanity is doing the same thing over and over and expecting different results
P-Unit's Frasha commented on the post, saying the boy group also terminated their contract.
"We already removed our songs from MCSK a long time ago."
MCSK is mandated with providing a fair formula for sharing revenue from ringback tunes between artistes/copyright holders and telecommunication companies.
The company has for years been castigated for paying artistes peanuts while the bosses take home full pockets.
MCSK is currently headed by Ezekiel Mutua. Prior to his appointment, he served in the same capacity at the Kenya Film Classification Board (KFCB).
He said based on his competence, he will usher in a new dawn at the body, which deals with the affairs of musicians.
During the Malaika Cultural Festival in Voi, Mutua advised musicians to register with the organisation, which wants to sign about 100,000 musicians for their Collective Management Organisation(CMO).
"We should appreciate our artistes like they are appreciated in other countries," he said.
"Recently, Barbadian singer Rihanna joined other singers such as Jay Z, Dr Dre, Kanye West and others in the Forbes annual billionaires list. Why, then, should our musicians be paupers with all the entertainment they give us?"
Last year, the copyright regulator revoked the licences of the three royalty distributors for failing to meet its conditions on administrative costs and royalties.
The three were the Kenya Association of Music Producers (Kamp), Performers Rights Society of Kenya (Prisk) and the Music Copyright Society of Kenya (MCSK).
