Currently, creators are able to bypass UGC avatar bundle validations in Studio and break avatar guidelines. This can lead to the spread of avatar bundles that are not standardized for experiences (e.g. quadruped avatars, inaccurate hitboxes, obscurity).
However, manual creation of avatars is still able to get around it and pass validation.
If Roblox is able to address this issue, it would prevent the spread of exploitable avatars.