They even contradict themselves in this shit. There's what you quoted, but there is also this bit further up in a previous section:

We do not assert any ownership over your Contributions. You retain full ownership of all of your Contributions and any intellectual property rights or other proprietary rights associated with your Contributions. We are not liable for any statements or representations in your Contributions provided by you in any area on the Services. You are solely responsible for your Contributions to the Services and you expressly agree to exonerate us from any and all responsibility and to refrain from any legal action against us regarding your Contributions.

"We can use your shit however we like, but if your shit is illegal, you're the one who'll be responsible; not us."