The whole thing is quite complex
Basically Qatar was a satellite state to KSA until the beginning 90s when the son (the father of the current emir) became the emir by deposing his father.
Ever since, Qatar has been trying to create a name and gain influence in the Middle East. Being a country with small area and small population and huge wealth means they can waste money on all crazy stuff. The whole slave labour in Qatar narrative i.e. is quite often lobbied by other in order to ruin their reputation (its always Qatar never the other in media).
Since KSA is the big bro in the region, they demand the other GCC countries to do whatever they want them to do. Qatar is like the screaming little bro that didn't want to listen.
I will travel from UAE through Doha on Friday, let us see what happens.