Yes, you need to start two-tiered if you have this lock-in (I live without it) and small:
I touched on this here:
https://mastodon.social/@HistoPol/111001873072512649
and here:
https://mastodon.social/@HistoPol/111000178133825731
And some place else that the UX must be like WhatsApp, easy to install, free or be able to be gifted, etc.