I wrote this sentence:
This helping hand should come from the government as companies might ask the talentful students to appear on their advertisements in return, which is unethical.
Grammarly Premium warned me that talentful is actually not a word.
Ngram says that since 1840s it is not common but peaked in 1845.
There is no result for this word in Cambridge Dictionary online.
Is it incorrect English now? Especially for academic English? If so, why?