Siri, what is selection bias?
So your complaint is, "how dare they charge for a service they're offering"?
If you don't want to use it to create invitations, don't. There's zero requirement for you to have an account if others invite you to something, and it sounds kind of preposterous to complain about other people choosing to pay for a service that you can then participate with for free.
Where in my post did I say anything like "how dare they"? I just pointed out that the people I know who have iCloud+ are not likely to download this new app and use it.
And it's obviously not likely to get anyone over the pay wall to buy iCloud+. This invitation feature has many free competitors. I don't begrudge Apple for creating this, but I won't be surprised if I keep getting evites and paperless post invites, and never an Apple Invite or whatever it's called.
When I think of people I know who have iCloud+ subscriptions, it's mostly people who thought they needed them because of the scary notifications their phones sent them about running out of their initial 5GB of storage (which of course is not enough for any modern phone).
These are not people who are going to download and figure out how to use a new invite app. They are going to keep using evite just like they always have.
There are some people who may use iCloud+ or a bundle because they like the fitness features or have a family that makes it make sense. I probably know some people like this. But I have never had a conversation with anyone about iCloud+, ever in my life. Only dealt with questions from non-tech-savvy family members who were scared about notifications that they were running out of space and needed to "upgrade" to this paid service.