VoiceFace TOS
These are the general Terms of Service for voice databases distributed on the VoiceFace website.
While these terms serve as a general base for all vocalists distributed, please note that individual vocals may have differing terms; as such, please ensure that you read through the details of each voice database carefully to avoid any violations of ToS.
The ToS are subject to change at any time for any reason. These are the terms as of 20/07/2023:

General Terms 
Commercial use of voice databases is allowed by default.
Commercial use of the characters attached to voice databases is allowed by default.
NSFW/R-18/R-18G content permissions will depend on the database, however will be allowed for default terms. Please refer to their individual page for more information related to R-18 content.
Usage of voices for purposes such as political statements, slander, or other disruptive activities is strictly prohibited.
Usage of vocalists for religious statements is also prohibited, except for in the case of songs such as hymns.
Using voice databases for the following types of expressions is unconditionally prohibited:
- Explicit underage sexual content
- Criminal and/or illegal content
- Bigotry and/or hateful content
Claiming authorship of these voice databases is prohibited.

Characters and Artwork
Published works using voice databases may or may not include visual depictions of the character.
Artwork does not need to depict the vocalist.
Minor edits of character artwork for works using the associated database are allowed (overlaid filters, silhouette, flipping, etc.).
Major or malicious editing of character artwork is not permitted.

Redistribution
While these voice databases are being publicly distributed, redistribution of the databases in their entirety is not permitted. However, parts of the database (such as an edited oto) may be distributed so long as any changes made are clearly stated.
If any database is discontinued, it may be uploaded on archival sites (such as UTAU Lost Media) for the sake of preservation unless the database's individual terms state otherwise.

DISCLAIMER: VoiceFace and its members are not responsible for damage of any nature to the user or any third party resulting from use of these voice databases.

Failure to comply with these terms may lead to you being blacklisted from signing up for opportunities such as beta testing new voice databases.

You'll also have to live with the shame of breaking some rules for a vocal synth. :P