It was predictable that a telephone or cable company would challenge the rules proposed last December by the Federal Communications Commission to guarantee that the Internet remains an open network.

Still, the lawsuits filed by Verizon and MetroPCS earlier this year against the F.C.C.’s net neutrality rules are disappointing. The suits fall into a swirl of antiregulatory fervor among Republicans on Capitol Hill. The continuing resolution passed by the House last week forbids the F.C.C. from using any money to put the new rules into effect.

That bill, and the lawsuits, risk stripping away the F.C.C.’s light-touch attempt to ensure that the Internet remains open  an approach carefully crafted in months of negotiations with Verizon and other companies.

The suits could potentially free Internet service providers from regulation  allowing them to treat their own content better than that of rivals, and block content that they didn’t like or competed with. Verizon and AT&T have about 60 percent of wireless subscribers. And 80 percent of Americans live in areas with only two wireline broadband providers. In a market with such slender competition, consumers are likely to lose out.