Proton
Empowering you to choose a better internet where privacy is the default. Protect yourself online with Proton Mail, Proton VPN, Proton Calendar, Proton Drive. Proton Pass and SimpleLogin.
Proton Mail is the world's largest secure email provider. Swiss, end-to-end encrypted, private, and free.
Proton VPN is the world’s only open-source, publicly audited, unlimited and free VPN. Swiss-based, no-ads, and no-logs.
Proton Calendar is the world's first end-to-end encrypted calendar that allows you to keep your life private.
Proton Drive is a free end-to-end encrypted cloud storage that allows you to securely backup and share your files. It's open source, publicly audited, and Swiss-based.
Proton Pass Proton Pass is a free and open-source password manager which brings a higher level of security with rigorous end-to-end encryption of all data (including usernames, URLs, notes, and more) and email alias support.
SimpleLogin lets you send and receive emails anonymously via easily-generated unique email aliases.
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I'm not sure what what you think is involved in "linking" your Gmail.
It's all standard procedure when switching to any new email address or service.
You go to your old email, set up an auto forward. That way while you're telling all your various accounts your new email address, you don't miss anything that's still going to the old address.
It doesn't give Google any access to your Proton account, Proton emails, or anything really. Just the knowledge that you're using another email. If that still bothers you, the address you have Gmail forward to could be a SimpleLogin address. That way even Google doesn't know what your new Proton email address is.