RE:TFSA penalty That's actually not true.
First, the CRA does have the necessary information to be able to "track" your gains. Your financial institution provides it to them every year.
Second, they explicitly state that "any income that is attributed to deliberate over-contributions will be subject to the tax on advantages" which likely means it will be taxed at the highest level.
In the end, you still come out well ahead, but it's not such a sneaky and ingenious thing as you think.