The #SIMKL platform needs to clarify what they meant by “All submitted reviews become the licensed property of Simkl.” It's vague and can be interpreted in various ways.
For example, that wording appears to me that when I submit reviews, I transfer ownership to them. The reason for this is they used the words “become” & “property”.
Thus, “become the licensed property” would mean that I transfer ownership then they license it however they want, since it is now their property.
See: https://support.simkl.org/knowledgebase/articles/905976-reviews-guidelines
They can just follow/copy #TMDb's Section 2.b.
https://www.themoviedb.org/terms-of-use
Or, @trakt 's Section 5.d. https://trakt.tv/terms
Which is pretty much the standard for #UGC or #UserGeneratedContent.
For example, I want to submit a review. I definitely am not transferring my ownership, I am only granting an irrevocable license…
“Granting an irrevocable license…” is different from my content becoming “the licensed property of <service>”.