Is IoTeX built on Ethereum?

Could you elaborate on the relationship between IoTeX and Ethereum? I've heard some speculation that IoTeX is built on the Ethereum blockchain, but I'm not entirely sure. Could you clarify if this is true? If not, could you explain the differences between the two platforms? Specifically, I'm interested in how their consensus mechanisms, scalability solutions, and interoperability features compare. Additionally, could you discuss any potential synergies or areas of collaboration between IoTeX and Ethereum in the future?