There are two aspects of commerce here.
The ISPs charge for their services, and other companies conduct commerce across the ISPs' networks.
Thank you for you patience with this discussion.
It’s important to define commerce for the following reason. Regardless that the corrupt, post-FDR era feds are now regulating insurance, the unconstitutional Obamacare insurance mandate for example, a previous generation of state sovereignty-respecting Supreme Court justices had clarified the following.
Insurance policies are contracts, not commerce, regardless if the parties negating the contract are domiciled in different states. Congress’s Commerce Clause powers therefore do not include regulating insurance policies.
"4. The issuing of a policy of insurance is not a transaction of commerce within the meaning of the latter of the two clauses, even though the parties be domiciled in different States, [emphases added] of indemnity against loss.” —Paul v. Virginia, 1869. (The corrupt feds have no Commerce Clause (1.8.3) power to regulate insurance.)
In fact, regardless that people pay for airline ticket to fly from one state to another, such a transaction is evidently regarded as a contract.
Contract of carriage
That being said, note that Thomas Jefferson had suggested interpreting Congress’s limited powers narrowly, the Commerce Clause in this example, forcing the states to amend the Constitution for new federal powers if necessary.
"In every event, I would rather construe so narrowly as to oblige the nation to amend, and thus declare what powers they would agree to yield, than too broadly, and indeed, so broadly as to enable the executive and the Senate to do things which the Constitution forbids." --Thomas Jefferson: The Anas, 1793.