I guess a good amount of the HN crowd would say that this can be replicated from within Home Assistant (probably with some LLM help) with the added benefit of even better hardware freedom (from cheap Aliexpress soil sensor and/or sprinker or drip system to brand-name ones) and total control of data.
Still, the same thing was said about Dropbox; hopefully there's enough people willing to pay for the convenience to sustain this business.