Nope, I think it is a good idea for me to warn users about a possible issue with a site that will eat their system resources. That is the most important thing to me.
https://steemit.com/steem/@julienbh/steem-supply-is-mining-using-your-browser
It's not an unfounded rumor.
edit: Just to be clear mate, I do think it is pass to pass along random rumors. In this case I could've done better by actually linking to the accusation in the post rather than just referencing it. I'll try to do that next time