It is notable that the illustration for the FT article is a literal Pie in the Sky (but given that we're talking about Brits here, it's probably filled with eels or blackbirds or something weird like that)

From the WSJ:SpaceX’s record-breaking IPO tested the limits of an obscure financial metric. Anthropic’s could push it even further.The maker of Claude is likely to tell investors its potential revenue opportunities are above $30 trillion, topping SpaceX’s $28.5 trillion estimate, according to people familiar with the matter.Tech startups or other growing companies going public often estimate their “total addressable markets,” or TAMs, to show investors they have ample room to grow. Such figures estimate the amount of annual revenue a company could theoretically capture if it achieved 100% market-share using inputs ranging from industry data to bankers’ models.While they have always involved a bit of guesswork, these estimates are especially squishy when it comes to trying to predict how the rapid adoption of artificial intelligence will upend entire industries.Elon Musk’s rocket maker called its TAM “the largest actionable” market in “human history” when it revealed the figure in a…