MASHABLE - Fidelity, an investment firm involved in financing Musk's purchase, now values Twitter at around $15B, a 33% decrease from the original price. Fidelity has consistently downgraded its holdings in the company since Musk took over, further reducing the value of its stake. Twitter's challenges include losing half of its major advertisers under Musk's leadership, and subscription-based revenue models like Twitter Blue and Subscriptions have failed to compensate for these losses.