Kbin was just a year old when everyone went there. It went from a few hundred to a couple thousand and then to 50k users in a couple weeks. It was literally one person, @ernest, until a few weeks ago. Lemmy has had a few years of people working on it, an active subreddit for a few years. The Lemmy creators were active on several subs for years. It’s not a surprise that kbin just now has more than one person working on developing.
Not just that, but you also have things like MRI, CT, and PET imaging in the medical world that would suddenly not need liquid helium and nitrogen for operation. Scientific instruments like NMR and high resolution FT-MS machines will stop using all the liquid helium and nitrogen. It will save are rapidly disappearing helium resources and allow for that to be used for other things.
Then there is mass transit that can be developed. The list goes on.