Wrong. If he was using computers that didn't belong to him, then it would be illegal your jumping the gun.

What do you think a botnet is?

He said 'bot farm' that could just be a group of EC2 servers. He didn't mention botnet. A bot is just an automated program, a bot farm is a group of automated programs.

Google's spiders are a bot farm. But nobody considers that illegal.

It could be.

It isn't, though.

I don't see how this is illegal. Immoral, yes. Against the ToS of a website, yes. Possible grounds for a lawsuit, yes.

But illegal? Not unless I'm actually stealing data, making a profit, or accessing areas I shouldn't be.

How do you think botnets are formed?

You surely don't believe folks are granted access to all those computers, right?

He said Botfarm not Botnet, two different things.

Bot farm isn't a term.

Malicious != illegal. There are many activities that might be technically legal, but definitely are malicious.