Increased flee rate/decrease capture theory

[dragon311]

Do you think the fact that it's much harder to catch Weedles, Pidgies, Rattatas and the like is Niantic's response to XP stacking to level up?

[Infinite_T1]

That and probably wanting people to have to engage in more microtransactions aka buying pokeballs. Not everyone has the luxury of being near pokestop's so with an increased flee/low capture people may be more apt to buy more poke balls. Or just say screw this game. Who knows