Silicon Valley start-up capitalises on surging investor interest to raise $500mn in fourth round of the year
Publishers accuse company of ‘freeriding’ on valuable news content
Investor frenzy over artificial intelligence continues after OpenAI valued at $150bn in latest fundraising
AI search start-up develops ‘sponsored’ question system in effort to gain share of $300bn digital ads industry
Artificial intelligence app boosts usage and sales despite controversy over its data-gathering techniques
