Why doesn't anyone suspect that Sai could be a computer bot? Hikaru makes Sai play Go over internet with the nickname "Sai". Sai is very powerful, and defeats everybody, even Meijin.

I don't know how to play Go very well, but I perceive that a computer algorithm that plays Go can be written easily. And I believe that there must be a lot of Go bots all over the real world currently.

Why doesn't anybody consider the probability that Sai could be a computer bot? I'm very surprised that it is not mentioned even once during the entire series. Is there a reason for this?
Firstly, the manga was released in 1998 which was just about when the Internet was exploding all across the world and the dot-com bubble taking shape. Similarly, the off-the-shelf hardware available at the time was a shadow (think 300 MHz Pentiums) of what is available now. Things were far different back then than they are now.

Secondly, while it might be possible for computer algorithms that play Go to be written reasonably easily, algorithms that seemingly play Go well is exponentially complex. If you consider Deep Blue, the chess engine that beat Kasparov 2-1 (out of six games played) in 1997, it used racks of cutting edge hardware calculating 200 million positions a second, and intricately tuned software specifically built for the purpose by IBM. It didn't exactly overpower him. In terms of board size, possible moves and combinations, Go is far more complex and demanding than chess and it would have been extremely unlikely for any 1998 desktop software to be able to match Go grandmasters of the time.

Lastly, incorporating cheating and other negative elements of real life was unnecessary to the story and would have hamstrung one of the objectives of the manga, that being the aim to popularise the game of Go.