I mean literally anything that leverages modern APIs.
WYSIWG Site Builders, text Chat bots, audio Transcription, voice synthesis.
Yeah building from scratch would take longer, but you can slap a UI, a DB/schema around modern APIs and output something that would be science fiction 10 years ago.
You think people would pay billions for a site builder??? Or that it would have been SF 10 years ago? I take it you were not around much 10 years ago.
WYSIWYG sure builders existed 10 years ago and did not cost billions. Chat bots were a novelty since the NFT bubble hadn't popped yet, and they would invent NFTs to stake the economy on instead. Audio transcription and synthesis existed and did not cost billions.