There is one difference: violence. Laws are enforced on threat of violence. A business cannot force you to follow their procedures, at most they can deny you business. If I start selling drugs I import at a cheaper price, the government will use violence to stop me (including potential enslavement for a few years).
That's a difference, yes, but orthogonal to the topic.
As a businessman, as much as you can direct the behavior of both your customers and your employees, you can influence the lawmakers. After all, they too want money or things that money can buy.
Violence is just one side of the coin that is power. The other side is voluntary (or technically voluntary but not quite) participation, which is primarily controlled by money. That's what makes politics and markets intertwined.
Then healthcare shouldn’t be a business because the natural result of refusing to provide it to those in need is injury and possibly death. That seems a greater and more imminent threat that people in the US face than most forms of state violence.
Everyone who can does that. Laws and politics aren't a separate magisterium from business; there are no hard borders here.