Also: we only know about this because one of the world's best hash-collision experts, Marc Stevens, wrote a tool to detect the method of collision used when we

Also: we only know about this because one of the world's best hash-collision experts, Marc Stevens, wrote a tool to detect the method of collision used when we have two different cleartext with the same hash. He's also one of the minds behind shattered.io ; which happened because Google decided to invest some resources on his research (estimated at around ~300k). Imagine if he "simply" took a job working for an intelligence agency ?