Stupid question maybe, but would your backups even be safe? Sure, it was mentioned that you had to enter your sudo password, but let’s say you did that because you are careless, “rm -rf” would wipe all connected and mounted drives as well, so your backups would be gone, wouldn’t they? Or does Timeshift mount and unmount on demand? If so, what would happen if you ran “rm -rf” while a backup is being saved?! It seems to me that a simple “make backups” isn’t enough here.

You said:

Building a commercial product on top of a free open source software is pretty awful practice

But as @Deleted said, a lot of stuff you use daily is based in some form on FOSS. Linux was just one big example.

I agree that building a commercial product on top of FOSS without giving back in some form is pretty awful practice. But the bold part is important. Simply taking something that’s free and open source and using it for your commercial product is not bad, it’s more common than you might think. But if you do that, you should give something in return.

Oh boy the face once he realizes that Linux is foss and who uses it.

Afaik a one-time-purchase to get rid of the ads is planned.