Some would call it price-fixing (That is, companies getting together and agreeing to charge the same price so nobody loses out – everyone gets a bigger slice of the pie).
ISPs would deny it and say that with something like internet access, costs are mostly fixed – they all use the same infrastructure (Within most areas – ductwork, cables etc), there’s a limited amount of civils companies that can dig trenches etc, so they supply their services at a roughly similar cost to each company, and the back-end equipment is much the same (Cisco, Juniper etc, etc).
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