As written, if you suggest something, it seems to me that they'd own the idea - and you wouldn't be able to use them yourself.

'... all right, title and interest in and to ... including all associated IP Rights...'

While it may be intended to protect them, that's hardly justification for such a sweeping transfer. Less total licensing could have been worked out.

Indeed - there's an example of such in the article:

'... shall have a royalty-free, worldwide, transferable, and perpetual license to use or incorporate into the Service any suggestions, ideas, enhancement requests, feedback, or other information...'