Yep, agreed (see the last sentence in my post).

The weird icon is the iOS share icon assuming you’re talking about the box with an arrow pointing up. If it was switched to the Android one you’d have the same problem but for a new set of users.

There isn’t really a universal share icon unless you consider the swooping arrow Youtube and Facebook use. Sorta unconventional for native apps. Or the icon could change depending on OS.

You can, but you can’t use the app. Instead, you configure your DNS to target NextDNS IPs.