I refer to this article which has affected TEZOS blockchain, a major competitor to Cardano: https://www.coindesk.com/why-harvard-research-on-a-low-profit-tezos-attack-matters-for-proof-of-stake.
There is reference to “Selfish mining” in the article when referring to TEZOS, but this should refer to Selfish staking because TEZOS uses POS.
For the non-Techies audience - Whoever, from IOHK, is going to respond to this question please, keep it understandable for most of us non-techies.