First and foremost, bitcoin is highly manipulated by whales (whales are people who can move the market with the amount they hold) Bitcoin can be sent to one person or another within minutes for a very small fee, millions can be moved for $10 as an example. Bitcoin and exchanges aren't regulated, so exchanges do a lot of wash trading. Exchanges have been hacked and millions stolen. This isn't for the faint hearted, people have lost their life savings due to a culmination of things I've written here.
You can become rich if you have the patience, but its a long road reading and learning, a friend of mine stuck around 140k into it around 2017, he was down to about 30k at one point, now he's at 1.5 million