Sam Altman praises the Chinese AI chatbot, DeepSeek, for its impressive capabilities and affordability.The development of DeepSeek has surprised investors, highlighting the unpredictable nature of technology revolutions.There are concerns about market concentration and the belief in first-mover advantage, drawing comparisons to the dotcom bubble of the late 1990s.The availability of impressive and affordable Chinese AI versions could lead to increased competition, potentially lowering returns for AI companies.