It isn't possible, but you can choose which subs where you want to subscribe.
There will be a moderated list of subs (maintained by the main developer), but users will be free to try to find an join even the most controversial ones.
I am also unable to download and I doubt _my_ cache is the issue as I've never visited this site before. Is anyone able to download the Windows client (or any other)?
I think the farfetched idea is; PayPal wants a stake in it if it happens but can't endorse it by publicly talking about it.So using eBay's brand makes more sense.
You can instant accept any bitcoin value that is lower to the investment to do the 51% attack or similar.
Example: no one is going to make a 51% attack to steal only 10 bitcoin from a vending machine.
Simply put a limit, or just say to the user that any amount of bitcoin over X will need Y time to get verified.
Anything lower that X amount will be instantly processed.