>>10342172collector scale is an actual thing, as it differentiates itself from the toys found in children toy aisles and makes collectors feel like they're getting more value for their money, as collector toys are generally pricier than children toys.
So who knows if McFarlane had to make their toys 7" (or 1:10) scale for getting the Fortnite license at the same time as Jazwares had their 1:12 line, but it 's likely.
This way they AREN'T competing. This is very important for licenses, as the licensor and licensees each would like to sell as much as possible. They generally want to avoid overlap, which can cause lawsuits to happen.
Just to note, McFarlane was making CoD, Game of Thrones, Destiny, and other lines in 1:12 scale during that period. So again it points toward it being a legal thing.