The regime is trying to “break the rice bowls”, meaning break the power of the elite and oligarchs, and certain state owned industries where corruption was beyond rampant. They began with a massive crack down on general corruption arresting very powerful people and other more ordinary corrupt politicians and businessmen. That program is and will continue on a massive scale. They then cleaned out members of the regime who were old guard and not followers of Xi and this massive crackdown. This was to eliminate as much top level pushback and possible retaliation as possible and to eliminate the threat of a coup. When they go after these top people they take down the family so there are no potential enemies. Bo being the prime example. In short they have been clearing out anyone who might pose a threat and who might try a coup of some type. That includes oligarchs who have wide networks and power.
They next took down the men who controlled oil. That had a bigger reason. Then they took down the railway industry which blew thru $100 billion budget per year and a substantial amount was stolen. It was the most corrupt of all government agencies. Next they are working on coal. The reason to first take down oil was so now when they go after coal they push oil in to replace the coal. Don’t believe the nonsense that this shift from coal is really all about climate change. They do want to cut pollution, but It is much more about consolidating power and ending the massive corruption and powerful people in the coal industry. Similarly they took down the leaders of several provinces. There were three provinces that were especially corrupt and were their own power centers able to ignore Beijing and do what they wished. .