The table on JA:Available_Data says that we can use data on websites, such as names, addresses and phone numbers because they are not copyrighted works but facts. However, Tomoya is against such a point of view. He thinks that licences for these data are not ODbL-compatible and that we should refrain from using them.
We have unanimously agreed that websites which provide secondary information, including Wikipedia, Wikidata and curation sites must not be used for sources.
The main point at issue is whether we are allowed to use official websites that provide primary information or not. Some of us think that we can use data from official websites unless it is prohibited by their term of service.