There was no foul on Messi and there was no bookable offence by Sterling. Not even borderline.
Do you agree that - hypothetically speaking - if the referee was on the take, the best way to go about securing a result wouldn't be to disallow the other team's goals and to send off their players for no reason?
If someone, somewhere wanted to influence the game, it would throw the entire game into disrepute by being so obviously one sided. It would be far more beneficial to play the long game and not be so explicit so as to keep the wheels turning without drawing so much attention.
Like I stated much earlier in the thread, I'm no conspiracy theorist but all sides must be considered in order to draw any reasonable opinion rather than flat out accusations or flat out denials.