We can not provide multiple addresses now, because the monitoring of one address takes a significant amount of CPU resources.
You mean free resources of Telegram servers? since when watching addresses for transactions takes any CPU power?
Because the bot is free - we can provide only one address. Perhaps in the future the number of addresses will increase.
Do we need to be online for the bot to work or it uses your servers or Telegram cloud? what if somebody with a large amount of either ETH-BTC use your bot and you find them somehow to take their coins?