"I wouldn't touch it with a ten-foot pole" is a common US idiom. (I've never heard "barge pole.") It's often used about an investment, or a business deal, or something else that is considered to be dangerous, risky, questionable, possibly illegal, or of very low quality.
"I wouldn't touch bitcoin with a ten-foot pole."
"I like a good Philadelphia cheesesteak, but Subway has no clue how to make them. I wouldn't touch a Subway cheesesteak with a ten-foot pole."
Another common idiom, often phrased as a command when giving advice, is "Avoid it like the plague."
If you have been disappointed or cheated by something, you can say "I've been burned by..." So, you might say "Avoid bitcoin like the plague. There are just too many stories of people getting burned by fraudulent exchanges. I wouldn't touch it with a ten-foot pole."