Things may change soon
Prior to Bulb going south companies simply failed and the transfer system moved customers to another supplier. Bulb was far too big for this so is running with a £1.7Bn bailout* which should see it through to the spring price cap change - the government is effectively a domestic energy supplier providing subsidised power now.
If the market price hasn't dropped significantly by spring then the consumer price cap rise needed to allow the suppliers a 'break-even' retail price will become the issue leading into the UK May local elections, millions of voters waving eye watering winter bills will be demanding affordable power.
Market economics are very secondary to mid-term political imperatives.
* 1.7M accounts - about 5% of UK domestic, no other supplier has the hedged future supplies to allow them to accommodate this many extra accounts and purchasing what they need on the spot market would likely drive them out of business as well.
Biting the hand that feeds IT
