Why articles which are two or more year older still locked when companies change so much in two years?

A lot of things change for a company within a quarter. So 2 years is a pretty long time for any analysis to be of high current value.

So was wondering why Seeking Alpha keeps 2 years or older articles locked ?

If many people are clicking such articles those, it might make sense to keep it locked. If not, why not open it up for free access ?