Thing is, bot lane is where your ADC is. That's the bitch that kills objectives real fast. If you form a Raid and go gangbang the enemy bot lane whenever they respawn, then your ADC can get you a million turret plates + tower first blood + dragon.
Also, bot lane is where your support is. Generally, that's the bitch with the most CC on the team. Especially if you're a roam-happy mobile assassin like, oh, idk,
, you eat that shit up. You ain't got no CCs of your own to secure kills, since Riot has deemed that your class doesn't even deserve to have a reliable slow, so bot becomes the best place to go.
Then, with that in mind, you can look to everywhere else on the map. Top has Herald, but that doesn't spawn until 10 minutes in. People don't wanna just sit on their ult until 10 minutes, they want action ASAP. Plus, the enemy top laner is probably tanky as fuck. Maybe they aren't building full tank at that stage of the game, but ALL traditional top laners have an insane amount of effective HP. They can heal, they can shield, they can gain bursts of bonus resistance, they can ult and gain a couple hundred bonus health. Point is, they're gonna be hard as fuck to kill.
Mid? That's where the mages and assassins are. Assassins have all the mobility you can want, while mages are generally twoshotting waves from 1k units away by first back. One will never let you touch them, and the other will never let you get a wave under tower for the dive. Besides, what's there to get from mid? A kill? A few turret platings? Why go for pure gold, when you can get gold AND everything else by going bot? Besides, depending on if the enemy jungler tries a desperate counter, bot can have 2 to 3 ppl for your team to kill. That's a lot more gold.
Invading the enemy jungle is honestly even worse. One, it can be pretty annoying to catch junglers. A fuckton of walls, a crapload of bushes, and a lot of room to get collapsed on. Besides, just knowing where the jungler at takes a lot of game sense. You'll need both solid vision and a solid understanding of the enemy jungler's mindset to really predict where they will be to even start the fight.
Overall, it's really not just a problem of winning bot lane. Fed bot lanes win the game, but a lot of that is because the winning team focused their roam presence around bot lane and got all the things you could win in that area. Everybody who isn't bot lane can also get a lot of rewards from babysitting bot lane. You don't actually have to play support to win games either, just play a jungler/roaming mid.