A Falcony Heavy probably generates 1 kiloton of CO2 per launch. Data centers on the planet are highly variable depending on their energy mix. It's true that a large a datacenter running on natural gas or coal power is significantly more in a year, but the sheer number of launches required to get that same data center into space is actually comparable, and there's no saying that this is the end of it. Oh and we should also have questions about how you safely de-orbit these things.