0958 GMT - Baidu faces greater risks than peers such as Alibaba and Tencent, despite its advantages in the search-engine market, strong AI capabilities and a large net cash position, says Fitch Ratings, which downgrades the company's long-term issuer default rating to A- from A. "Tencent's and Alibaba's EBITDA scale are significantly larger, have greater revenue diversification and stronger cash-generation," Fitch says. The two companies' social network and e-commerce platforms also have a larger share of advertising spending than Baidu's search engine, Fitch adds.