Fears of a crash in the technology sector following the success of a new AI model are weighing on stock markets in Europe. The Chinese AI assistant R1 from DeepSeek, launched on January 10, overtook rival ChatGPT as the top-rated free software application in Apple’s App Store in the US on Monday. Due to its popularity, the website was briefly unavailable. On Monday evening, the company also announced that it had to temporarily restrict the registration of new users due to cyberattacks.