I don't think that's how it plays out. Microsoft has a lot of users on their mail services. If you -- as a business -- cannot reach these users, most of them ar

I don't think that's how it plays out. Microsoft has a lot of users on their mail services. If you -- as a business -- cannot reach these users, most of them aren't going to blame Microsoft. They're going to blame you and probably choose not to use your website/shop/... unless there is a previously established relation. Thus your deliverability troubles are now a "you" problem. Because you're going to lose customers over it.