Users can't choose if their records will be used in Wikidata or Wiktionary. Using them is not always a good solution, especially if the speaker is not a native speaker or if the records are numerous. Also, it is not also obvious that their records will be used on Wiktionaries, and they could feel betrayed.
I propose a checkbox :
☑ I want my records to be automatically used on Wikidata and Wiktionaries