I read previous posts about VST2 support which was of course not possible given it required a proprietary license. But I didn’t find a discussion about VST3 (my bad if I missed it!).
However, the VST3 SDK is licensed under GPL3:
Mixxx is licensed under GPLv2+, so I guess that supporting VST3 would require to switch to GPLv3.
Is support for VST3 a future possibility (or even planned ) and only hindered by a lack of contributors, or is there a blocking issue in licensing I didn’t notice?