I just wrapped up a long job search process, where I got offers from a handful of companies. I currently work at FAANG, so I was looking for a pay bump.
The only companies that could beat my current comp are other big tech and finance, but there were a couple of surprises along the way.
For example, a Tier 3 (i.e. you never heard about them) company offered me 450k TC for a Staff level position. This compares to the 500k TC for a senior level position at FAANG. I also interviewed for a Startup that offered 650k TC for a Principal level, although the stocks were paper money.
To your point, "random" companies can come close to FAANG salaries for high enough levels, but it's far from a given. In fact I'd say most random companies probably top in the 200k range.
If you are interested just start every conversation with a recruiter asking for their comp range. I found these days almost all recruiters answer, and then you can decide if it is worth your time to go ahead.