SD Maid 2/SE is not fully Free
You can not use "Apps Cleaner" without purchasing pro version. its a freemium app. So, why this app listed here?
So, why this app listed here?
🤷🏽♂️ Because it's foss. F in foss stands for freedom not free of cost see https://www.gnu.org/philosophy/free-sw.html and article by Stallman GPL has no restriction on commercial usage https://www.gnu.org/philosophy/selling.html
All the source code are provided and you can modify, compile, redistribute as you prefer. They don't even enforce the pro version to IzzyOnDroid/F-Droid users by choice. https://github.com/d4rken-org/sdmaid-se/discussions/536
There are few other apps listed here as well, that requires purchasing premium/pro version.
@shuvashish76 has already summarized the topic well. I think we can close here.