anyone that can. e.g. a smallish company basing their business on top of an api from a bigger one like twitter or google could feel safe knowing that they could

anyone that can. e.g. a smallish company basing their business on top of an api from a bigger one like twitter or google could feel safe knowing that they couldn't legally remove access later. and if they did that small company could recoup their potential earnings through litigation. it works just the same way as gpl does to code.