Why? Because the people who make money don’t like dealing with the founders.

Purely made up example: board of directors decides they can make the mosy money by pivoting and rebranding as “the customer service company”. They will throw away all the models built with copyright material, build simpler models based on customer service scripts and interactions from customer businesses, and save a ton on compute while making bank on licensing and professional services. No more free chat, etc.

A founder doesn’t like this new direction that is antithetical to their vision for the business so they go around telling shareholders to get rid of the current board and for employees to quit or otherwise not help with this.

Board sees this messing with their genius money printing idea so they fire them.