hi, welcome to the community
there have been a few posts on this topic, here are a few:
Open Source Release Date? - General Discussion - Anytype Community
Why should we trust Anytype? - General Discussion - Anytype Community
As far as i understand it, given they are still in an Alpha stage they won’t be making it open source. It ‘MIGHT’ be made open source once it goes into public release, but even then - not sure.