"mood-tracking the owner and trying to influence his mood through AI" It would actually be interesting to know how to interpret the usage of AI in the context

"mood-tracking the owner and trying to influence his mood through AI" It would actually be interesting to know how to interpret the usage of AI in the context of GDPR. Since the purpose of the processing must be pre-determined, yet with AI the data collected may be used for a purpose determined by the AI. Also "mood-tracking" will certainly fall under article 9 - special categories. You might end up in a situation where you have to delete all previous data and renew the consent every time someone installs a new "app".