Such parity provisions are considered a violation of Japan's Anti-Monopoly Law because the lodging facilities that enter into such contracts will be unable to freely conduct business since they would be obligated to provide favorable treatment to the booking sites.

In particular, such contracts prohibit the lodging facility from offering rooms on its own website at rates lower than those listed on the booking sites.

The contracts also make it more difficult for competing booking sites to undercut rivals by offering lower commissions to the lodging facility.