I often read and heard about burning tokens that were not sold when the ICO project was finished, I also knew that by burning the rest of the token was a strategy so the price of the token didn't fall, but if the DEV and the team didn't burn it was a crime? is there a requirement that the remaining unsold tokens must be burned?
There are also projects that choose other strategies, store unsold tokens or freeze them for several years with the aim of developing products. But I think burning token is the most rational choice for investors to maintain the value of their investment