Assuming this company has fun work to do (you'd hope so), there's nothing stopping them just giving you their work. It doesn't matter that it's open source if you're not going to use it and no-one else apart from them…
Really, this is no different from the offline coding test, except that since the code is open source it might be useful to someone later. I'd never do this Github interview for an open source project that was not very…
Assuming this company has fun work to do (you'd hope so), there's nothing stopping them just giving you their work. It doesn't matter that it's open source if you're not going to use it and no-one else apart from them…
Really, this is no different from the offline coding test, except that since the code is open source it might be useful to someone later. I'd never do this Github interview for an open source project that was not very…