Juantomás García gave a presentation on PaaS (Platform as a Service) using pigeons at Databeers Madrid. He proposed training pigeons to detect cancer tumors as an unconventional method for machine learning. Some key points included that pigeon clusters can achieve 99% accuracy after a month of training and discussing how to identify individual pigeons, design an API, and scale the pigeon cluster. The presentation maintained a lighthearted and humorous tone about using pigeons for complex data solutions.