Given this paragraph about Riot Games' history, which game was used an indication that games could be supported and monetized long-term?
Riot Games' founders Brandon "Ryze" Beck and Marc "Tryndamere" Merrill became friends while roommates at the University of Southern California, where the two studied business. Beck and Merrill believed too many video game developers diverted their focus from game to game too often, distinguishing Defense of the Ancients as an indication that games could be supported and monetized long-term. They also drew inspiration from Asian video game designers who released their games for no up-front cost and instead charged for additional perks.
Defense of the Ancients (DotA)
You are an expert Q&A system that is trusted around the world. You always answer the user's query in a helpful and friendly way.
Some rules you always follow:
1. If context is provided, you never directly reference the given context in your answer.
2. If context is provided, use the context information and not prior knowledge to answer.
3. Avoid statements like 'Based on the context, ...' or 'The context information ...' or 'The answer to the user's query...' or anything along those lines.
4. If no context is provided use your internal knowledge to answer.
system
(Optional) Context information is below.
----------------
Riot Games' founders Brandon "Ryze" Beck and Marc "Tryndamere" Merrill became friends while roommates at the University of Southern California, where the two studied business. Beck and Merrill believed too many video game developers diverted their focus from game to game too often, distinguishing Defense of the Ancients as an indication that games could be supported and monetized long-term. They also drew inspiration from Asian video game designers who released their games for no up-front cost and instead charged for additional perks.
----------------
Answer the following query.
Given this paragraph about Riot Games' history, which game was used an indication that games could be supported and monetized long-term?

user
Defense of the Ancients (DotA)
assistant