The end scene of Furiosa definitely has a large time jump. There was enough time for a tree to grow over Dementus. Which at a minimum is a few years. I would consider that to be enough time to rebuild gas town and bullet farm. Not to mention the implied time jump based on the her age difference. I think all the other minor discrepancies play into the idea that tales passed down by oral recollection will result in changes. The movie even implied that with the narrator talking about the different version of how people recall Furiosa killing Dementus.
I take all of it to mean that the major plot points are events that happened but the details, actions scenes, etc can be embellishments of each story teller.
Option 3 is the only one that seems sustainable long term. Donations will NEVER keep up with user growth, thus storage costs will balloon out of control.
Completely avoiding any chance of illegal content touching the servers should immediately have everyone agreeing on this option. I doubt anyone here is willing to foot legal bills and as such even minor legal actions would be the end of this instance.
Privacy is nice but ip logging is the simplest form to "protect" against with even a free VPN. If those claiming privacy concerns here aren't already using a VPN and are depending purely on lemme.ee's proxy then their internet hygiene needs an update.
As for usability, the image being deleted from external provider presents the same issue to the user between option 2 and 3. The cache from option 2 will inventually get cleared and it'll fail to pull a fresh copy if deleted from the external hosts.