How can I create a RPM repo and hosted in a cloud service?

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Copr could be a solution:

https://fedoraproject.org/wiki/Catego...

https://copr.fedorainfracloud.org

Copr, as already mentioned, is great for hosting FOSS applications. If you for some reason need to host proprietary software, you need to host it on your own web server (the terms of Copr won't allow hosting other than free and open source software). Dropbox and Google drive won't work, because you can't host and share a directory structure with direct links to files. You need access to the web server home directory, so that you can create the repo directory structure. I use the createrepo command to create the structure and rsync the directory structure to my web server. You can easily script this.

A Fedora repository is a directory of RPMs and metadata available over HTTP(S) or FTP. You can create the metadata by using createrepo_c, then upload the entire directory to a webserver or any service that allows anonymous access.

COPR is a great solution for this that handles the metadata generation and hosting for you, and is also integrated into dnf (dnf copr enable...).