I'd say Bitcoin is currently seen as a more significant polluter because it relies heavily on energy-intensive processes like mining, which requires a vast amount of computing power and consequently, a lot of electricity. This has raised concerns about its environmental impact, especially in areas where the electricity comes from fossil fuels. Generative AI also consumes a significant amount of energy, especially in training large models, but its overall environmental impact is often viewed as less when compared to the massive, continuous energy demands of global Bitcoin mining operations.