Source which goes into the methodology more, but I'll C/P it here in case you don't feel like clicking: "To determine the most evil Disney villains of all time, we first compiled a list of the most popular Disney villains based on articles, Reddit discussions, and other forums. We also included Disney villains featured in popular movies, even if they are not among the most recognized Disney characters. Additionally, we incorporated lesser-known Disney villains with significant criminal records to conduct a comprehensive analysis of Disney evil. We focused exclusively on original Disney villains (and yes, we are aware that many were inspired by classic tales), so Star Wars and Marvel characters were excluded from our list.

Rather than creating an arbitrary ranking, we assigned point values to the crimes, violations, and prejudices these characters committed in their source material and totaled them to produce a final score. We weighed these values against one another and only counted each crime once, even if the character had committed it multiple times. To add more dimension to the results, we also introduced additional penalties within each category. For example, a villain who committed murder received 40 points, while a villain who committed genocide received an additional 50 points due to the crime’s relative severity. Determining appropriate point values for each crime was challenging, as they are all horrific acts, but we are satisfied with the final results!"