Threats and intimidation don't constitute free speech, even when veiled. Note that I don't think anyone is advocating for more/harsher laws to protect free speech (although these might be welcomed by some), only appealing for a cultural shift away from cancellation and toward free-speech values.
I believe free speech does not cover "true threats". I don't think a consumer complaint threatening to not do business is going to be considered a "true threat" against a company.
Free speech doesn't cover any kind of threats. We tolerate "veiled threats" to the extent that we can't confirm that they are threats, and they are difficult to confirm by design and definition. They exploit our presumption of innocence.
Threats of all kinds are made every day, and often in completely legal contexts. Threats of violence are often less tolerated, but even in some contexts protected under freedom of speech.