They are explicitly adding their information to FB why do they need a button to not share the information? Would the button disable them from checking in and updating their profile?
replyAn E2EE system (e.g. as offered by Apple iCloud). Or a terms of service guarantee. (e.g. Dropbox, Anthropic and 1000 other companies that partition sharable user content from non-support divisions.)
reply> Would the button disable them from checking in and updating their profile?
No.