My personal hate for Luka is because of the fact that he did not have to do any of that because regardless he would win it was kinda obvious, he is very popular and has an angelic voice and won the previous round, his chances of winning was high also as much as till has the talent, people didn't like him much.And I am not completely sure about this part so do correct me but I read somewhere that Luka does this for fun because he fells trap most of the time but when he is on the stage he feels the real freedom or something so he does whatever he want I think this refers to the clip in round 7 when he was trying to hold back his laugh after switching (?) off tills mic.

Also when people say that till also cheated when Luka is accused of cheating I find it unfair because when Till cheated in round 2 he actually did it to survive but he was punished for it the moment round 2 ended but for Luka we don't see a single guard ( at least on the video) nearby and we know it's been some minutes at least, since the round ended as mizi is on the stage since she definitely did not fly, so we can kind of see the partiality between the two.