1. I wonder why Byes are given to seeded players? In this case 32 byes are given to top seeds while 48 players are competing in qualifiers. Isn't this an unfair advantage to top seeds? Aren't 32 players denied the chance to participate?

This actually gives lower ranked players the chance to participate.The 32 best ranked players get in automatically and the other 32 spots are up for grabs in qualifying rounds. By having straight entry based on raking, there would be no way a lower ranked player could participate. It’s not an unfair advantage to the seeds, it’s an opportunity for the non-seeds.