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tried the app.

1. not open source.

2. has pay-to unlock feature but no idea what is behind the paywall. the website doesn't mention having to pay for it

3. does not have sponsorblock or anything related to that in the settings

edit: i don't care about "OSI compliant is only open source", rather i am fine with any free license

There's no paywall, it just asks you to pay for the software. You can use it without paying for as long as you like, but it's paid software. See: WinRAR

call it donationware then. that sets the expectations of people accordingly

It's not a donation, you're expected to pay for it. Donations can be of any size, this is a $10 one time payment for the use of the software. There's a license key and everything.

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