People complain about cheaters constantly (which they should, of course). They don't necessarily say "speed hackers" in their posts because there's more than one kind of cheating. Lots of people are talking about it, just not using your specific words.
Also, Snail/WC aren't going to talk about it much, if at all, because they don't really care about cheating, they only care about pretending to care about cheating. It's important to remember that Snail has an employee clan (which includes the CEO of snail) and they are very well known to be a big pile of cheaters. These are not people who care about cheating.