We've heard this before. First of all cheating isn't against the rules unless you get caught. There's no price to be paid for accusations.
Secondly your statement is totally false. There is no way every single program is cheating. That would be impossible. There are different levels of cheating too, where some programs might have walked in lighter shades of dark.
Until a program is proven to have cheated, it's a bogus claim to make. Many run with because it makes them feel better about their program.