Basically every service that provides maps requires attribution. The problem with OSM is that they cannot reasonably include other data with a license that also

Basically every service that provides maps requires attribution. The problem with OSM is that they cannot reasonably include other data with a license that also requires attribution at the usage site. That little »© OpenStreetMap contributors« in the corner would balloon into 600 different entries. Unless they all are fine with not being mentioned, but they typically do that not for free. There are a number of exceptions. A few CC-BY datasets can be used in OSM because the owner is fine with an entry on a Wiki page is sufficient attribution; Bing and Esri allow their aerial images to be used and only require the changeset to mention the source; etc. But each of those is a separate agreement.