Well, then maybe you can't scale it as a free service with self-serve signups. Maybe you need to gate who you allow to use it and pace how intensely they can engage. Or maybe you need to look for other solutions.
Yielding to "not feasible at scale" is exactly how we ended up with a lot of today's most pressing and almost intractible problems, from social media's ills to person and society straight through to enshittification and non-repairability.
> ...straight through to enshittification and non-repairability.
funny as "enshittification" was the topic of a 99% Invisible pod just a few days ago and I also was listening to the new Stewart Brand book that Stripe published. i fixed a Norwegian desk I bought a decade ago on Valencia. happily not feasible at scale but neither was how i broke it :)