Bedbugs are on the rise many major cities around the world, particularly in hotels. Even the nicest hotels in NYC have to worry about them.
They have nothing to do with cleanliness. It's not an issue for cleaning professionals. It's an issue for pest control professionals, and they have a devil of a time dealing with them.
Nobody in the carpet/upholstery cleaning business has any business trying to sell any service or product to combat bed bugs. If you find evidence of bed bugs whilst cleaning carpet and upholstery, you should tell the homeowner and advise them to get in an exterminator.
The only thing cleaning professionals need to worry about is avoiding picking up the bedbugs, themselves, and carrying them to the homes of clients or their own homes.