It’s normally short for “suspicious”. It gained popularity from being used by players of Among Us when it shot to popularity during the pandemic.

I had never seen it before that.

It’s used wrong in the title, but that’s because it’s an accident. The headline was cut off:

“…over 30 million Chrome users sus_ceptible to intrusive ads”

Underscore to make the cut obvious.

It doesn't mean the following but in British English 'sus' means 'assessed' or 'figured it out', as in, "I've sussed it and it's nothing to worry about". I'm not sure how far back this usage goes but Douglas Adams used it in THHGTTG in Zaphod Beeblebrox's mouth.

Source: http://onlineslangdictionary.com/meaning-definition-of/suss

if you're sus, you might be the imposter.

Normally “suspicious” or “suspect”. If you click through though you’ll see that here it means SUS as in Single UNIX Specification.

> Google pulls the plug on uBlock Origin, leaving over 30 million Chrome users susceptible to intrusive ads

character limit, as others said.

Susceptible? The usage looks unusual to me as a native speaker

suspect, but susceptible on this case