Hi @wesley_mendes_s - I understand the confusion and I'm happy to share why you're seeing this.
Retool originally designed this feature to support applications that offer unrestricted access to the public before adding the ability to self-host retool. Because self-hosted customers use Retool behind a VPN, however, these applications are not truly public and our engineering team pushed a fix to patch this. We’ve also developed some first class feature sets to properly support the use cases we most commonly see, which you can read more about here. 
At a high level, public apps are now available on all Cloud plans and self-hosted folks on Enterprise plans can reach out to their account team to discuss access.