Comment by YZF

Gaza wasn't blockaded when it was handed to the Palestinians. Only later when Hamas came to power: https://en.wikipedia.org/wiki/Blockade_of_the_Gaza_Strip

EDIT: Just want to add that the reality is more nuanced. Naturally Israel affects control over its border with Gaza and Egypt affected control over its border. Israel has definitely refused to let Gaza operate an airport or a sea port and so it maintained some amount of control together with Egypt. That said a lot of how this evolved was around choices made by Palestinians and the rise of Hamas led to the official blockade being imposed. I do think this was an opportunity for Palestinians to demonstrate how they can govern territory controlled by them and be peaceful neighbors which ofcourse did not happen.