IMO the good news about CodeFleo is, that they are very transparent of how they do the job. And as fare as I understand them, they store data in S3.
Then their operating costs are extremely high and they will either shut down or find a way to recoup them.
Repo data, which is the majority of the data, is stored on disk. "Packages" (including container images) and other image data on S3. Not on AWS, so costs are like 1/5 or less. We have per account quotas for different types of storage.
All of this is transparently explained in our docs. No need for speculation ;)