I assume you're talking about Lemmings betting against fire because they want data centers to burn.

If there's a lot of people betting, then why wouldn't there be depth?

If the data center is causing measurable harm, then a victim losing the bet against fire is still a net gain. If you're acting rationally, then you can afford to do it repeatedly — like insurance. But if people are just flushing their money down the toilet because they hate something and gain nothing from its loss, then they'll go broke.