You are right to question the authority of the leadership.
They are a publicity machine with great finance through the prosperity gospel behind them. To build such a movement in such a short time takes dedication. The problem is it is just the music. Going to a cinema for massive meetings is like going to a pop concert. Sometimes this is the image people want to create of fellowship and meaning.
Maybe one should call this the cult of electronic music linked to worship. It is great for an emotional high, but when hard times come and you need roots and real reality, it is just hay and stubble. I wonder how long it can go on with this branding, and lack of depth in local communities. A lot are now turning away from this pop culture, to other things. My children have been members of similar groups, and are now disenchanted with them because of a lack of friendship and connection. But on a lot of levels, the worship and praise of Jesus is great. I love some of the songs, as part of my worship life, but then I equally like old hymns which are sung in many different environments. God bless you