[misiti3780]

Depends on your definition of widespread. There have been level-4 leaks multiple times in the past. England had an outbreak from a level 4 lab in the past 20 years:

https://en.wikipedia.org/wiki/2007_United_Kingdom_foot-and-m...

[SiempreViernes]

Notice the use of "novel virus", you gave an example where a known virus escaped. SARS-COV-2 was not known before the outbreak in Wuhan.