Usually, you would include splash logos at the beginning of a game to credit various middleware that you've used. Say the company has dissolved or for open source the supporting group has simply moved on and declared the project over. In the hypothetical situation where a middleware project has been discontinued and you still have the legal right to use it, wouldn't you still include the logo for that project at the beginning?
Only concerned with the opening splashes, since I'm pretty sure it would be polite to credit the individuals who worked on that piece in the text credits or at the end.