[belorn]

Google can afford to re-implement software. It is questionable if they even get hurt much by release delays, especially if the new product is within their eco system. Thats the benefit of having monopoly or monopoly-like position in a market.

If you are on the other hand in a highly competitive market then re-implementing code and delaying launches can result in being replaced by some with more flexible approach. My go-to example is the gaming industry. As an example, if you have a webbased ticket system it might not matter much if there is a download button, and developer time is much better spent on finishing the actually game than writing one more ticket system.

Game studios in general seems to have very flexible approach to licenses. To my knowledge they will apply all methods if it means saving time, as long as they can keep the game itself proprietary and sell copies. They will any software directly if they can, buy if it makes economical sense, or even just ask the author for an exception (with attribution in the credits).