Exactly, people are giving up fundamental security for very little free resources and a tiny, tiny one-off performance improvement. But, what people also don't

Exactly, people are giving up fundamental security for very little free resources and a tiny, tiny one-off performance improvement. But, what people also don't seem to care about is that these CDN's are actually created to track both users and site traffic as well. No bank uses (or should be using) third party CDN's, but other sites seem to not care.