sorry but I believe you are mistaken , there is both control and moderation on both the main fdroid repo and other repos .
- the official fdroid repo only requires apps to be fully FLOSS , see their inclusion policy
- izzydroid requires the app to be both free and gratis , not promote “violence, hate, harassment, racism and similar topics” and to have limited tracking see their inclusion policy
other repos only include apps from a single project/dev
not exactly a DAW/VST but VCV Rack is a open source (though with a pro version , the pro version can work as a VST though I never used it in that way) eurorack modular synthesizer symulator if you want to experiment a bit