I've seen a link on HN in the past where the author was questioning why we think it only happened once - and whether every puddle on the planet might have the e

I've seen a link on HN in the past where the author was questioning why we think it only happened once - and whether every puddle on the planet might have the early stages of life appearing, only we discount it because we assume it's contaminated by the rest of the biosphere on the planet leaking in. I feel like it was some researcher rather than some conspiracy theorist, but I don't know where the article was or what the context was to find it.