Based on what you've posted here alone:
Companies that don't have to be profitable is not quite the case to make. They have to either provide a service valuable enough to gather continual revenue from investors or subsidies to exist... or they have to have a plausible promise of becoming profitable. Easy money really lowers the bar on how plausible that promise needs to be.
Ripping up on that E brake by hiking interest rates has a twofold effect: first it raises back the bar on how useful a service or profitable a company is or aims to be for investors. Secondly it has an overall effect on the economy, including profitable companies with strong investments since all loans are subject to the interest rates. So while that can produce the intended deflationary effect, the whole economy has to recalibrate.
And that's where things tend to feel like they're going to shit.