Does enshitification happen because companies are publicly-traded?
Isn't that a prerequisite for enshitification? Publicly-traded companies are required (by law, I think) to maximize profits for their shareholders, even if that means utterly ruining their original product (Reddit, Boeing, etc.), yes? What do you think?
While I think shareholders can be a driving factor, I see it way more often with VC-funded companies. The "2.5x year over year" growth mantra that places like YCombinator stipulate have disastrous effects on small tech companies. Often, these startups have an incentive to keep taking additional funding rounds, which appears to tighten the grip the VC has over them.
Try growing the next Microsoft or Google or Amazon out of that model. I'm not convinced that it's possible. At least if you bootstrap your own company, you don't have the same binding obligations...even if it takes way longer to get to a place that's self-sustaining.
IIRC most successful VCs invest very early and get out often early-ish too.
The real enshittification that dangers the actual position of the company often happen much later. At that point the company is traded publicly and there's a large anonymous body of shareholders - they only care about profits.
VCs are actually a little smarter and care about longer time frames as in that early stage often much larger (relative) growth rates are possible.
At a late stage (think Google, Twitter, Facebook, Reddit etc today) growth is much more difficult. How could Google grow today? They've saturated the search market years ago. So the only way of making more money is by sucking more money out of their existing user base. And they absolutely need to do it, as there's huge pressure on the managerial class to do it, because the shareholders demand it.
If the managerial class doesn't do this (because often some older idealistic people know it would compromise the quality of the product), or they aren't capable of doing it - they will get replaced by people who are more willing or capable - even if it's detrimental for the company when viewed longer-term.
VCs i would argue care all about profits, "but". (they are smart enough to see the big picture. They are also small enough or "few enough" that they can communicate among themselves in order to agree on a more wise plan. That's why they often get out once most of the possible (easy) growth has been achieved. They either know that now growth is much more difficult, or that the company's value is much more stagnant - ow might decrease even. They can get out and invest their money in other more promising endeavours.
The shareholders of large publicly traded companies are not that coordinated as they cannot really agree on anything other than just "growth". More sophisticated strategies would have to be negotiated (and communicated) among thousands. The only unifying bond among shareholders is that they want profits. Think about it: many shareholders often don't even know what companies they own as they are often part of other investment packages. Maybe you're retirement plan has invested in stocks of 50 different companies, or 10 different fonds that have invested in others still. That is a form of dilution (?). It's very difficult to communicate any strategy more sophisticated than "profits". (a side effect is also that many people have invested indirectly or wothout knowing in endeavours that make their life more shitty/expensive when they retire - without knowing it.) There isn't enough nuance in the wants of the masses as to want any more sophisticated strategy than simply "growth". That's why only short term growth can be thought.
Of course sometimes also large companies can grow 2.5x or something like that. But it's rare and takes more time. The exception makes the rule here.
Early stage growth that VCs bank on is much more explosive i think. More like 10x or 100x.