Yes they use it all the time as an argument against bitcoin and take advantage of people who dont know about it. Cardano guy does it all the time.
Discussion
Pretty tough to do statistically right? Not a real threat from my view..
I remember reading a paper from like 2013 explaining why it wasnt a big deal but cant remember more than that
Selfish mining is risky to attempt. Sometimes you win big. What I am worried about is collusion with selfish mining (which is basically 2 pools added together being more than 50%) (like foundry and antpool) which can frequently win selfish mining attacks. They would get caught pretty quickly and it would be an industry scandal and tank the price for a bit. But it would definitely shatter mining pools into tiny bits.
Sounds hype
Sometimes collusion may be involved. Right now Foundry + antpool is just over 50% of network. So on paper they are separate pools, but who knows if there's communication.
They're just pools, not miners. Miners are the ones who would be colluding or communicating. And I wouldn't be surprised if there are some large miners who mine on different pools at the same time, just to avoid the pool getting close to 51%
The thing is... why would you assume you can find two blocks before EVERYONE making up the rest of the network can find one? It's pretty rare.
Unfortunately, right now, Foundry and Antpool make up just over 50%, so yeah, their may be collusion starting.
However, the theory is this is bad for the price, and nobody is longer Bitcoin than miners.