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?
It is in need to be done because burning of unsold tokens was also part of the project's outline for the whole run being planned by the team. Burning of unsold tokens is done to control the number of circulating tokens which is successfully being sold when the sale was aired and is also a way for the value of the tokens not to fall due to excess supply of the tokens in the market which is not being used since it was unsold during the sale. But burning of tokens can be also delayed after the project has been done if the team have decided to get into the phase two of the project and do the second wide sale of the tokens for an improve plan of the project and make it accessible again for more potential investors to get into their project.