> Do they know they are, essentially, expending you?

I don't about the OP's specific situation, but there are definitely managers and management consultants that consciously try "expend" their employees.

Jeff Bezos is a famous example. IIRC, to avoid "complacency," he wants constant turnover of employees. Hire new people, burn them out while they're new and enthusiastic, then replace them. That's why it's occasionally leaked that Amazon consider such-and-such employment market mined out (e.g. everyone's either worked for them or is wise to their ways), so they have recruit further afield.

My boss is young, passionate guy overhyped with LLM claiming at least once a weak my and my colleague days are counted and LLM will fully replace as and we are cost.

When I joined I thought this is peaceful place, after a month this changed tremendously.

And this is third job like this in a row so I have no hope to find anything even slightly as peaceful as 5y ago