Barca fans split over shirt move
Barcelona is more than a football club: literally it is because it is involved in other sports as is often the case in continental Europe. But more than that is a symbol of Catalan nationalism and is linked to memories of the Republican side in the Spanish civil war.
It is also held up as an example of how fans can own and run a club. Unfortunately, this seems to have led to massive and almost unmanageable debts which is why Barca has had to compromise its principles and accept a lucrative shirt sponsorship deal from the Qatar Foundation.