How would ElevenLabs know if you used them without paying for a commercial license?

If you just generated voice or sound effects on the free plan, downloaded them, and edited them into your video which you then uploaded to YouTube, how would they ever know?

Would YouTube’s automated system be able to actually tell “hey this unique non-copyrighted voices was generated by ElevenLabs”? Because even if they MANUALLY copyright claimed your video, how could they PROVE that you used their service to generate your voices or sound effects?

Do they have some super advanced AI that can somehow actually match the sounds in the videos to ElevenLabs servers and database all the way down to matching with your one specific sound?