The Hamas created content from Oct 7th isn't what gained widespread popular support for the Palestinian cause, it was both what Israel has done to the Palestinians but also a thousand Streisand effects kicking in as many powerful actors immediately went to war with anyone who wasn't staunchly pro-Israel. This increased general awareness of the situation pre-October 7th and things like Nakba and the previous, peaceful March of Return where Israeli snipers shot thousands of protesters.