Possible progression:
AI voice becomes common (paired with AI-written/rewritten content).
Tons are produced.
No one likes the content, and engagement overall on the platform goes down (perhaps moreso because the AI content makers create large popular channels and good keywording / algohacking so dominate search results / recommendations.
Platform suffers as no one can find content they like on it anymore.
Platform bans AI written / voiced content.
???
If it gets clicks, YouTube won't ban it.