Free software / open source allows charging money. This is even intentional. See also https://www.gnu.org/philosophy/selling.en.html https://www.gnu.org/philoso

Free software / open source allows charging money. This is even intentional. See also https://www.gnu.org/philosophy/selling.en.html https://www.gnu.org/philosophy/selling.en.html In case of copyleft licenses, the only thing not allowed is preventing your buyers from exercising the same freedom you had. That is, they are allowed to redistribute without cost, and they too are allowed to sell.