How did Jolly Roger become the flag of pirates?

I see no evidence in the text for the origin of the title "Jolly Roger" in the text. There are a few different opinions on this. First, some believe that story of Roger de Flore, an infamous pirate and Knight Templar, was responsible for the symbol. Others attribute the name to Bartholomew Roberts, a 16th Century bucanner, who was known as "Jolie Rouge".

I also found the following information when researching;

The first use of the term “Jolly Roger” in print appears in 1724 in Charles Johnson’s The General History of Pyrates (now attributed to Daniel Dafoe). Some scholars believe the term is an Anglicization of the French “joli rouge” name for the terrible red flag. Others think the term “Roger” or “Old Roger” – a common 18th-century nickname for the devil – and the grinning skull inspired the name. Regardless of its origins, pirates raised their versions of the Jolly Roger long before the name entered popular use.