But instead it turned into a game of "hodl" to get rich.
Scams were openly perpetrated in the forums.
I became completely disillusioned. What exactly does bitcoin offer the world today?
Aside from perhaps gold, bitcoin is the most successful currency in the world not associated with a central bank and state.
It's the most liquid asset that is not issued by a central bank. At any point you can issue a transaction to anyone else in the world, without the possibility of a third party intervention. I've had issues pulling cash out of banks, or limited sizes available for money orders, or having debt/credit card transactions incorrectly flagged as fraudulent and blocked.
Most countries/systems have one central bank, even if we assume there are only 2 mining pools and they "control the network", wouldn't a central bank still be more centralized?
Besides, the mining pools don't "own" the network, anyone can participate, which kind of makes the whole "more centralized than a central bank" argument kind of weak.
> do all sorts of other shit
There's not much shit they can do, without breaking the fundamental cryptographic primitives that make it work. They can't steal money. They can double spend, as above, or they can delay transactions with a probability proportional to their ownership of compute, integrated over a period of time. If they own 80% of the compute, and they really really don't want you to perform a transaction, then they can block it for 10 minutes with 80% chance, 20 minutes with 64% chance, 30 minutes with 51%, an hour with 26%.
Compare that with Visa which has blocked transactions it doesn't like (e.g., porn) for years.
And even this blocking is economically disincentivized. If you want to get a transaction through and the "mafia" don't want it, you can offer a higher transaction fee. Either the "mafia" will have to accept your transaction, or give up the enticing fee to someone else. Transaction processing is a free market.
And compute dominance is something that needs to be maintained indefinitely. Obtaining compute dominance does not guarantee future dominance (unlike with proof of stake systems, which is IMO one reason why proof of work is superior).