This stuff is expensive because supply is much lower than demand. If everyone was to run their own hardware with a batch size of 1, we'd have 100x more demand for inference hardware and electricity than we do now, and people would be even more frustrated. Efficiency is everything, and we need all the economies of scale we can get to meet demand.
The cost of not being efficient is even higher DRAM costs than we have now, given supply and demand.
It's easy to rattle off a half-dozen different vectors of likely enshittification over the next few years -- ranging from increasing censorship, to lower rate limits, to removal of existing features and forced addition of unwelcome new ones, to extortionate price increases, to unexplained and irreversible account bans. The only way to avoid them all is by running weights you own on hardware you control.
How smart and how fast is your local model? Those are certainly important questions, but "Does it exist at all?" is more important.