It depends on why you are seeking an alternative service. Since you mentioned privacy, Proton Mail is, in theory, good for those with privacy concerns. Why in

It depends on why you are seeking an alternative service. Since you mentioned privacy, Proton Mail is, in theory, good for those with privacy concerns. Why in theory? Well, can't really trust anyone these days, can we? I mean, trusting a convicted perp or an unknown entity? Well, the unknown might be clean still, so it's better than nothing. But in the end, for privacy, the best is definitely self hosting.