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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Assuming ProtonMail supports catch-all (I don't use Proton), this is fine and a typical use of the catch-all. You may get weird looks when you give a business their name back as your email, and if anyone figures out that you have a catch-all they might just spam you regardless, at any email address they want, e.g. "icanfreelyspamyou@catata.fish". I would add a string of numbers/letters at the end, like "target.akr8@catata.fish" so you can be sure when someone sells your email.
All said, it's a little bit weak to any determined adversary. Any human who figures out your plan can easily start playing around with it - Target may sell your email as "thisguywantsspam@catata.fish" and you'll never know who sold it.