They store the data on amazon servers. Isnt that a point of failure & not censorship resistant? 

If it is then why not store it on decentralised storage systems like filecoin or arweave?
 

 Don’t you have to have filecoin and arweave coins or tokens to use those services? I thought you needed their wallets to use their services. 

 Same with AWS. So in the case of flare.pub storing on amazon servers they pay with lighting? I doubt it.