Mega.NZ used to be a bastion of privacy and confidentiality and I suspect it still is. You may want to ask people around here more about that.
Either way, it needs an email account, and a hotmail account is tied to your phone number. I dont know which email is secure, confidential and private.
Protonmail was advertised as such, but it was Mossad.
Again, maybe ask around people that are more knowdleable than me. I have a spreadsheet of emails and accounts, mostly to secure email names.
(post is archived)