[xyst]

My card generates a new CVV every so often so this is painless.

iCloud makes it stupid simple to generate email addresses for individual services.

I do want to migrate away from Apple but for now this “just works”

[johnny22]

fastmail has masked email and I use that pretty regularly which can do the same thing. It also apparently integrates well with existing password managers like 1password and bitwarden. I haven't used that feature myself, but maybe it would work well enough for you.

[j45]

Both of these options are usable for the many and not the few.

Solutions will still require some level of buy in/committment to a platform for most users.