I can understand Ajax's fans frustration and emotional reaction, but the ref's decisions here with the exception of a second yellow to Veltman were correct, imo.
You should also understand that the rational reaction of a football fan is that Ajax has been screwed intentionally for 5 points, 5 points and not 6 thanks only to the class and daring of Ajax.
In Amsterdam the VAR failed to correct and award Ajax a penalty. After that a goal was disallowed and the evidence presented was tampered with. How can a VAR that wants to make the fair decision take the wrong moment when the ball was already yards from the foot to claim off side, and then send out the image from frames earlier like that was the frame used? If it was just a very stupid but honest mistake, the right picture on which the decision was based would have been showed and the crowd would have gone berserk immediately. Free kicks and yellow cards weren't distributed fairly either, 3 points robbed.
Then the UEFA decides that Ajax can't bring it's fans to London, turning a British stadium embarrassingly quiet btw, so there was nobody to loudly and or violently protest the upcoming fraud. Chelsea gets an extremely soft penalty early in the game, VAR could have corrected it because he just didn't bring him down. It was Blind who defended, if Blind wasn't there the Chelsea player could and would have shot. If he had chosen to go down after the light contact it would have been debatable, but he didn't. The ref didn't allow Ajax to take the corner before half time while there was still time to play. What's going on in a ref's head to make a decision like that?
Ajax was 'unlucky' with the yellow cards, Chelsea's second goal should not have stood after VAR for off side. The ref should have given Blind a free kick, maybe yellow for the foul after that, VAR should have stepped in. What happened after was irrelevant, but even in case it was, it's not the kind of 'foul' that gets any team a penalty and a second yellow against Barcelona for example.
Now everybody starts sugarcoating it because it was an entertaining and eventful match, but it's Ajax that is entertaining and makes the CL eventful. But that's not what the CL is for, it's becoming an invitation only party for sheiks, oligarchs and Glazers with their clubs and Ajax wasn't isn't invited. It's not that I don't accept mistakes and bad luck with decisions that could have gone the other way, it's just that all decisions at crucial moments and very strange decisions going against one team somehow never happens to let's say Barcelona. They have played twenty times more CL matches in the past 10 years but never experienced two matches like this. Not to their disadvantage that is.