But now you also need to convince a random person that they should switch,

This seems logically and factually untrue based on what Apple has stated.

From https://www.apple.com/newsroom/2025/02/introducing-apple-inv... --

    "Guests can view and respond to an invitation using the 
    new iPhone app or on the web without needing an iCloud+ 
    subscription or an Apple Account."

They don't need to buy an Apple device or create an account. (I would assume that they get a text message with some sort of unique individual URL, and from there they can respond to or view the invite)

So I do not follow when you claim that I would need to convince all my friends to "switch." Can you elaborate?