This is actually my preferred approach. If you want to put a 4gb base64 as your phone number, go right on ahead; best believe I will truncate it to a sensible length before I store it, but sure. Who am I to question your reality.

Sadly, people abuse shit like that to pass messages (like naming Spotify playlists with messages to loved/friends/colleagues while in jail) and maybe we have to assert a tiny bit of sanity on the world.