Project as a tab in Teams: Do not require license for viewing
When adding a tab in Teams for Project, many stakeholders are interested in viewing the plan, but it is very impractical to have to manage licenses for a potentially large group of people who just want to take a quick look.
Therefore, it should be default that anybody with an Office365 license should be able to just look at plans. For those who have assigned tasks, the current licensing structure is fine.
As long as a user is added to the group, they will be able to view the project even with just an O365 license.