Founder here: the advantages over FTP based approach are - no need to install extract tools and deployments are atomic, so you can rollback instantaneously.

Settings up Cloudflare or AWS CloudFront + S3 is easy for users who all familiar with technologies. What I have seen is, there are many web designers out there who design awesome websites but lacks technical knowledge. My brother was like that, he designs websites but I was the one who was helping him to host and write PHP scripts for handling form submissions etc... that's one reason I built a service like this.

Thank you for the suggestion on pricing, I'll consider it and update it accordingly.

Update:

Image lazy loading enabled when website optimization settings is set to "Full"