Yeah if you hate your spouse, don't have friends, don't have hobbies, etc, adding a few zeros to your bank account won't change that. But there are plenty of people who are unhappy largely because of the stress around the financial side of their lives.
Wealth brings with it plenty of other bullshit to make up for the bullshit you lost when you first obtained it, though.
While I've never been rich, I've been objectively poor and I've been comfortable, and the difference in mental load is unbelievable if you haven't experienced it.
That's another reason why I don't really understand the instagram bragging thing. It's like these people are actively trying to create bullshit for themselves.
There's a pretty fascinating British doco on the phenomenon that I saw on a recent plane trip. In some cases they are actually that vain. In other cases it seems kind-of ironic, like they are doing it just to troll online haters.