There aren't many precedents to work from, the closest is GPM but that's not quite a match and there your purchases were mostly transferred to YTM and you could

There aren't many precedents to work from, the closest is GPM but that's not quite a match and there your purchases were mostly transferred to YTM and you could also download your MP3s. On Microsoft side, they closed their eBook store and refunded everyone's books, as well as extra credit for people who had annotations which were lost. While Google does deprecate products, almost all of them were free / small experimental services, so while we don't know how they would handle this case, I still just don't see how they can shut it down without either transfering your licenses to another service or refunding you. Do you have any examples of them leaving people completely high and dry on something people had paid for? Or any other tech company for that matter?