The answer to the question of how many people know that Tezos is proactively building an EVM roll up is very few. This is because Tezos is still relatively new in the cryptocurrency space and is still in the early stages of development. As such, not many people are aware of the project and its progress. However, as the project continues to grow and more people become familiar with its features, it is likely that more people will become aware of the EVM roll up that Tezos is building. This roll up will allow developers to build and deploy smart contracts on the Tezos blockchain, which will open up a whole new world of possibilities.