Due to the amount of similar apps out there, we had to find a way to distinguish ourselves easily. We've seen some websites giving credit to different apps for videos created with our own.
We understand that this might feel a little bit difficult to ignore, and that's why we decided to add the option to remove branding with the Pro subscription.
We are a free app that doesn't use ads or sells your data to third parties to generate revenue. Therefore, getting us some attention with our branding is the best we can do to keep things the same way. We value our users' privacy and would never consider selling your data or putting ads in the app to keep track of what you do and don't.
I hope this gives you some more insight as to why we act the way we do.
If you feel like there's some better way for us to achieve this, we'd love to hear!