Genuinely surprised a simple, soulbound ERC hasn't emerged on Ethereum by now.

Anyone aware of someone working on one?

Working on Farcaster and Warpcast. Longer thoughts at https://dwr.email

isn't it just one line of code preventing transfer from happening?

this is how we do it after all

cto @ bwl.gg, 100M+ users (bdut.ch) 🙏 $eggs is life

Yes, but iirc there are problems with this approach. For eg. what if you wrap the token and then start transferring that (think transfer of SC wallets which hold the token.)
Not sure if/how this can be solved