RSNs are often controversial and protracted. The expense of the per subscriber rate led some major providers such as Charter Spectrum and Verizon FiOS to begin incorporating a fixed "regional sports network fee" as a separate surcharge within its billing statements as early as 2013. Most regional sports networks in the United States are either affiliated with Bally Sports or the NBC Sports Regional Networks, which produce and distribute supplementary programming – including professional and college sports events involving out-of-market teams, and sports-centered reality and documentary series – for their individual owned-and-operated member networks and any RSNs not under common ownership that receive their "nationally" distributed programming through affiliation agreements. in the past, some RSNs also carried supplemental programming from networks such as America One, AMGTV or ESPNews, though vertical integration and the impact of streaming services removing game broadcasts from low-tier broadcast networks has effectively ended this practice. In Canada, Sportsnet operates four regional sports networks, and the otherwise nationally distributed TSN also maintains some regional operations. This differs from the operational structure of RSNs in the United States, which are independently operated from national sports networks. An increasing trend is for the teams whose games make up the lucrative programming to own the RSN themselves. This serves two purposes: first, the teams make more money operating an RSN than they would collecting a licensing fee from an individual network or a group, such as Bally Sports. Second, by owning their own RSN, teams that must share revenues with other members of their league can mask its broadcast-related profits. Under the old model, a team collects a large fee for licensing its games to the RSN. That fee would then be disclosed and shared with the other teams in the league. Under the new, team-owned RSN model, the team demands only a nominal fee, so the profits for local broadcasts stay with the team. The owned-and-operated RSN model generally works best in the largest markets where advertising and cable revenue is larger; in smaller or fringe markets, the sale of rights fees is more lucrative. For example, the New York Rangers and New York Knicks have long co-owned their RSN, MSG; however, they also have purchased the rights to their rivals, the New York Islanders and New Jersey Devils. MSG also owns the rights to the Buffalo Sabres, however the team and ownership controls game production and that has