Probably a number of factors at play. I always thought alot of the early greats learned classical technique but i could be wrong. I know Ron Carter did, and even he is more on the pizz side of things even when playing melodies.
-Jazz bassists tend to have their bass setup for walking in the way of string choice, string height, and maybe even arc of the strings over the fingerboard
-Jazz/modern styles are just primarily played pizz so arco becomes sidelined or reserved to the practice room. some may not have time to practice both in equal amounts.
-Pizz offers more rhythmic possibility which suits a rhythmic style such as jazz(imo)
-Jazz pizz could be considered more ground breaking and exciting, while arco is the "old way"
But at the end of the day, many of the best jazz players spent time with the bow, so the above list are just hunches. I also really think that purely playing pizz gives plenty for a listener to enjoy as evidenced by a number of great bassists who choose to make it their main vehicle and stretch it rather far. When i saw Christian McBride recently, it really didn't bother me that he didn't even have a bow on stage. His pizz playing was so good that you really never needed a break from it.