A lot of the security concerns listed in the article, while entirely valid, would be mitigated by a combination of a permissions check similar to the ones that already exist for things like the Clipboard API and a UI element to show what connections are in use and sending data.
Any issues that exist about using it for DDoS attacks already exist for the available network request APIs.
Any issues that exist about using it for DDoS attacks already exist for the available network request APIs.