re: stablecoin arbitrage - it is a real thing, and I do it often - especially recently with the USDT scare. There's much to gain between the top BASE coins on Poloniex (BTC/XMR/USDC/ETH), the top BASE on Binance (BTC/USDT/BNB), and even Kraken has a USDT-USD pair. Can use BTC and EUR to buffer, and then use any of the coins that are rising that day to further buffer.

Here's your dose of conspiracy wrt stablecoins - what if all these stable coins are a precursor to Fedcoin, a Government-backed stablecoin, which will be airdropped to all holders of ALL non-privacy coins AND replace US dollar over some period of time. People will be incentivized to exit dollar for cryptos on a predetermined list, at pre-determined ratios, over a pre-determined period. By some date in the future, all taxes must be paid in Fedcoin.

Fedcoin would be modified fork of bitcoin. They'd implement universal basic income at same time, allotting some amount to each person monthly unless they earn. Each citizen assigned a private key. All the early adopters have a huge incentive, of course.

Can't happen? Venezuela mandates passport fees must be paid in Petro