Since "free" in this context means absence of coercion against extant or would-be competitors, and since government regulatory efforts are a source of such anti-competitive coercion, unless one is concerned with firms sending hit squads against each other (which would more rightly be considered "crime"), the distinction isn't particularly useful.
Predatory pricing. Buying up necessary capital. Paying other companies to not deal with you (Suppliers, Retailers, Advertisers etc.)
All completely voluntary, and these are just off the top of my head.
Offering a lower price to consumers than your competition is not coercion against a competitor.
>Buying up necessary capital.
Offering a higher price to suppliers than your competition is not coercion against a competitor.
>Paying other companies to not deal with you
Entering into exclusive deals with other firms is not coercion against a competitor.
It is if you are offering a price lower than your costs which you offset by cash from earlier deals, which the new upstart cannot do. When the new upstart is bankrupt you push the price higher, because now there's no competition anymore. That's the reason such stunts are forbidden (at least in civilized countries).
Indeed, even your decision of whether to start the company is influenced by the same market pressures.
In the end, if the market leader is constantly crushing competitors through undercutting to maintain their position, they are not really exploiting their customers at a monopoly and its a market win. It is still competition - the leader just moves to eliminate competition (which would piss off shareholders or anyone in general with a long term outlook on the company) rather than compete against it. As long as they cannot stop competition (and in a voluntary fair system, they cannot) then they have to deal with it one way or another.
This is a little imprecise; "free" and "free of governmental interference" are not the same thing. More likely it is because you have a _competitive_ ISP market. That might in turn be because of how free your market is, but in order to really know we'd have to know how your area solved the problems that led city governments to grant monopolies in the first place.