Reading the title I thought that the price was too low, but the linked page clarifies that it is just “for a small software without specific problems” and anyth

Reading the title I thought that the price was too low, but the linked page clarifies that it is just “for a small software without specific problems” and anything else requires a custom quote. Lots of things might come up requiring investigation on compatibility with the library versions available in the taget Debian release. It’s not enough for the program to compile and run in an ad-hoc system where you install whichever versions are known to work.