You have some good ideas here! Many people have wanted the onboarding process improved, but you offer solid ideas about how to do it! 🙂
"In my imagination the onboarding platform allows any user to make his first post by using less than 150 characters."
InLeo's Threads allow people to do this, already, to quickly sign-in to a "lite" Hive account using their X (formerly Twitter) or Google credentials, then begin posting short-form content to Threads immediately. However, your auto-tags idea takes this a step further! Kudos! ✨ The "lite" account can easily be converted to a full Hive account when the user is ready to claim their Keys at a later date.
"...scannable QR code with a Hive logo. Find me here."
Several people on Hive are already using these, so here's one for you, too! đź’ś