It's the same in the sense that a company with a product isn't necessarily obligated to support all potential platforms for that product. But maybe a better comparison would be to point out that web access for Exchange was not officially supported on Chrome for many years.
EDIT: To put a slightly different spin on it, it's easy to try to turn this into a moral issue rather than a business decision -- particularly with Google's foolishly-publicized "don't be evil" motto. But supporting multiple platforms requires additional resources, and companies have to make the business decision whether or not to provide them.
EDIT: To put a slightly different spin on it, it's easy to try to turn this into a moral issue rather than a business decision -- particularly with Google's foolishly-publicized "don't be evil" motto. But supporting multiple platforms requires additional resources, and companies have to make the business decision whether or not to provide them.