NAIROBI, Kenya — For weeks, popular Kenyan podcaster and radio presenter Francis Kibe Njeri has used his social media platforms to spotlight a problem he says many electric motorcycle riders face but few companies in the industry acknowledge: batteries unable to be swapped across networks and motorcycles that can be remotely disabled after periods of...

Amazon shares sunk more than 5% on Friday after the company’s hefty spending forecast surprised investors who were already wary that the artificial intelligence boom is at risk of becoming a bubble. The e-commerce company on Thursday was the latest tech giant to announce plans for a massive increase in capital expenditures, after Google parent...