devtrackers.gg
The in-game link for Twitch is displayed as http://twitch.tv/runescape, which got me looking more into the detail behind the displayed text.
The link actually goes to https://rs.game/Watch - great, our connection is secure. Except it's then routing via an insecure runescape.com URL, which is then redirecting to an insecure twitch.tv URL. These should all be running to HTTPS URLs...
https://i.redd.it/lqpkr0wi4xs31.png