Assuming you are asking why the software called Vital Synth is free:
The reason Vital Synth is free is likely because the developers wanted to make a name for themselves and increase their user base. By offering the software for free, they are able to reach a larger audience than if they were to charge for it. Additionally, releasing the software for free allows users to try it out and see if they like it without having to commit to purchasing it. If they find that they enjoy using Vital Synth, they may be more likely to tell others about it or even make a donation to the developers.