Hi @oanhpham, of course it's ok. Basically it will work for sbd or steem. Like, if you send the bot X amount of sbd with a steemit url in the memo of the transaction, then the bot will upvote the article at that url with Y percent voting power. The idea is to give you back at least as much as you put in. So for example, if you put 1 sbd into it then the bot should give you more than 1 sbd back from the voting reward. That's my goal anyway. Most bidbots on Steemit will just take a specific amount and give back a random percent of upvote.
The only problem is that no matter how much steem power I get for the bot it's vote can only amount to so much, so I think if someone sends it more than it can work with then it will send the remainder back to them after doing what it can. I plan to use a whole bitcoin to buy the steem power for this bot, so it should have a pretty strong voting power. But I still need to do some math to figure out all the numbers.