Why sign-up walls show up on 'free' tools at all
Requiring an account on an otherwise free tool is usually about collecting an email list or gathering usage data for later marketing, not about the tool actually needing to know who you are to function. For something as simple as spinning a wheel, there's no technical reason a sign-up step should exist.
Spinzelvo doesn't have one. There's no login, no email capture, and no 'create a free account to unlock more entries' prompt — every feature described on this site works the moment the page loads.