Using Predictive Search API in an App

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With the very unfortunate removal of partial product title search from the Admin REST API 2019-07 one now must use the GraphQL API for partial search. 


GraphQL and the API is not ideal. It requires  pagination to retrieve more than 10 variants for a product making use of it for autocomplete bad. 


I do see that the Predictive Search API can do this very nicely. Is it okay to use the API in a Shopify App or can it only be used for themes? Technically it works but for how long...