> Nokia's leadership was

Stephen Elop, Nokia President & CEO since September 2010.[0,1,2,3,4,5]

Since 2011 Symbian & Nokia starts its degradation under Elop 's "leadership".

[0] https://en.wikipedia.org/wiki/Stephen_Elop#CEO_of_Nokia

[1] https://www.europeanceo.com/profile/stephen-elop

[2] https://www.smartcompany.com.au/business-advice/strategy/how...

[3] https://www.theguardian.com/technology/2014/oct/08/nokia-ste...

[4] https://www.theverge.com/2015/6/17/8796465/grand-theft-elop

[5] https://www.theregister.com/2018/02/15/elop_and_the_fall_of_...

Which is to be expected when one gets a contract from the shareholders with a bonus clause if the CEO manages to devalue the company and sell it.