You should evaluate the FOSS software features AS IS and ask if you're okay with the current feature set if all future features are behind an "enterprise" tier. If you are, and the hosting of the current version is manageable, then the product is good for both sides. I've often found running the numbers for paying the vendor for cloud vs amortizing devOps costs comes out in favor of the cloud version. I see this as a win-win for both the customer and the company.
