I'm now assuming the part they don't like is §10.4(ii):
> 10.4 Customer License Grant. You agree to grant and hereby grant Zoom a perpetual, worldwide, non-exclusive, royalty-free, sublicensable, and transferable license and all other rights required or necessary to redistribute, publish, import, access, use, store, transmit, review, disclose, preserve, extract, modify, reproduce, share, use, display, copy, distribute, translate, transcribe, create derivative works, and process Customer Content and to perform all acts with respect to the Customer Content: [...] _(ii) for the purpose of product and service development, marketing, analytics, quality assurance, machine learning, artificial intelligence, training, testing, improvement of the Services, Software, or Zoom’s other products, services, and software, or any combination thereof_
Notice that 10.4(ii) says they can use Customer Content "for ... machine learning, artificial intelligence, training", which is certainly allowing training on user content.
This clause reads like the distinction is less about the contents and more about zoom's rights to use any content