It just seems like it will be amateur hour: immature founders who are in love with startup culture combined with junior and/or desperate employees who don't know better.
I don't mind working hard, crunch, or even acting like an owner but when the these listings also have average salary ($135k - $190k [0]) with no mention of equity (meaning it's either 0.00% or not substantial), that's not ownership; that's a bad deal. If you want me to act like an owner, I expect to be treated and compensated like an owner or at least more than a "cog role" at another startup would be.
Any founder who does the math on what it would take to hire a senior+ employee to behave like an owner (a very large chunk of your employee pool) will realize it's not feasible to hire like that.
[0]: https://wellfound.com/jobs/2524214-systems-software-engineer