Bitcoin has been the leader for cryptocurrencies for the longest time. For any in store purchases, membership fees, donation fees and so on. You can re-donation your btc donation to pay every direct 10 donation. The 0.0002BTC you donate is once, but when it reaches diredt10, you will get 0.001BTC, and every time you redonate it, your donation is multiplied by 5 times and it repeats infinitely.