I can understand that you want to build an open source DAW (that also runs on Linux). I can also understand that you are inspired by features of an existing DAW. But you are ripping of FL Studio completely (same names, same colors, same UI, even the logo...)

Did Image-Line do something that upsets you? They are actually a great company that have been improving FL Studio for almost 3 decades.

You buy it once and receive free upgrades for the rest of your life (I bought mine +20 years ago) There is no payway, no subscription. You can subscribe to FL Cloud, but that's completely optional.