This isn't new, although people may not be aware because they don't read the licenses.

For example, the following clause is in the Vocaloid license:

Originally Posted By: Vocaloid 3 License
3. Restrictions on use of the synthesized singing You may not publish or distribute in any manner the synthesized singing that includes lyrics which are against public policy of law. You may not publish or distribute the synthesized singing that is harmful to the moral rights of the third party including but not limited to the original singer of the Library.


The same sort of restrictions can be found in the UTAU voices. But in those cases, the voicebank providers may attach clauses as to the use of the voices.

In the case UTAU, people are voicing their moral objections to various content.

In the case of companies, they may want to avoid liability, as well as avoid having their product associated with specific political parties.

-- David Cuny
My virtual singer development blog

Vocal control, you say. Never heard of it. Is that some kind of ProTools thing?