Slightly annoying ads were meant to be seen more, since people just ignored banners by default.
Hidden ads (like an ad in an article which you really could tell it was an ad) were meant to increase the image of a company.
Disruptive ads like in YouTube or Spotify aren't meant for advertising. They don't really care about the advertising money, they want to force you to buy premium. The more annoying the ad is the higher the chances you pay 20€ a month for them to go away.
Apple is on it's best way to kill all 3rd party repair shops. Luis Rossman has many videos about it. Basically you don't get any schematics, Apple makes it illegal for you to buy replacement parts and they make it more difficult to repair anything.
Why would you update grub?
Also I am not sure if I am even using grub. Does systemd have a bootloader?
Normal people don't change their bootloader that often.