Well, I can think of a few reasons: facilitating transactions with other parties on the permissionless network, promoting public verifiability of your system, u

Well, I can think of a few reasons: facilitating transactions with other parties on the permissionless network, promoting public verifiability of your system, utilizing the tools and utilities available for public blockchains, requiring your data to be available even after you stop paying your hosting provider, avoiding the hassle of building your own payment on-ramps, etc.