To be fair it's a straightforward campaign leh, everyone gets the same rewards no tier system.
Then the link also very simple webform nia, emails also mostly template replies...
To me I think the delay mainly caused by shopee and Google la, but they also not helping leh like in your case also submit swee swee according to their webform still can tell you need extra supporting documents 2 weeks later and still need you to contact them first then know.
Then those fill up wrongly one also no news from them until 2 weeks later then say need to submit again and wait another 2 weeks...