Sources: 

Elon Musk's testimony at the trial against OpenAI revealed his claims of ignorance regarding the transition from nonprofit to for-profit.
Musk stated, "My testimony is I didn't read the fine print, just the headline." He expressed concern over the loss of OpenAI's original mission:
"I don't think you should turn a nonprofit into a for-profit... you just can't steal a charity." Musk is suing OpenAI for
$150 billion in damages, asserting that the shift prioritizes profit over safe AI development, which he believes undermines the organization's foundational commitments.
In court, Musk was also cautioned by the judge about his comments on potential AI-induced
“extinction”, emphasizing that the trial is not about whether AI represents risks. Despite Musk's allegations, OpenAI called his claims
“baseless and jealous.” Consequently, Musk is pushing for OpenAI's reversion to a nonprofit model and the removal of key executives, including Altman and Brockman.
"The for-profit is overwhelmingly where the value is," Musk remarked, reflecting his belief that the current structure contradicts OpenAI’s original intent to focus on humanity's benefit. His lawsuit aims to redirect OpenAI back towards its charitable goals, even as the organization defends its shift as necessary for
attracting private investment.
Sources: 
Elon Musk testified that he was unaware of the fine details surrounding OpenAI's transition to a for-profit model, despite earlier assurances from co-founder Sam Altman. Musk, seeking $150 billion in damages, criticized the shift as a betrayal of OpenAI's nonprofit roots and received warnings about discussing AI-related extinction risks.