Unxpected unanimity
The proponents argued for decentralization and financial inclusion, lower costs of transactions and faster transfers, limited supply of bitcoins which protects against inflationary policies of central banks and security and transparency.
The opponents put forward the arguments concerning extreme volatility of cryptocurrencies, irreversibility of transactions, no consumer protection and huge environmental impact.
Apparently the zest of proponents planted the seeds of doubt resulting in a relatively equal vote with a slight advantage of those against regulations.