eurochick I'll just quote from that 2nd link in my op "While foreign investors get special, secret international courts to claim their rights, CETA gives workers, citizens and consumers nothing: no courts or sanctions against those who violate core international labour standards, product safety or environmental protections. In other words, corporate interests get all the rights, opportunities and protections without any responsibility for their actions or having to exercise any social responsibility for the welfare of their workers."
Look at the kinds of cases brought under various ISDS laws mentioned in both, how are they 'fair'? What does that word even mean? You need to have two parties equally capable of negotiating to reach a compromise that will work for both.
Law, like everything else, is ultimately under the control of politicians, and if they're under the control of these foreign investors, or even local investors, laws will get changed in their favour. Remember the US' famous Mickey Mouse law? Copyright law here is also heavily skewed towards the needs of private companies now. Meanwhile poorer individuals in the UK have no recourse to the law nowadays.