Perplexity AI, a company creating an AI-based 'answer engine', is facing accusations of unethical practices such as dodging paywalls, plagiarism, and copyright infringement. The company has taken fire for its Pages product, which allegedly plagiarizes high-quality sources, and for ignoring the robots.txt code. Perplexity, while in talks to raise hundreds of millions of dollars, has come under scrutiny for its underlying business practices and the potential impact on the trust that underpins the internet.