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Notes -
First, it's not clear what the ublock numbers are actually measuring. It could include things like ad-like elements removed from the page, or requests blocked that get automatically re-attempted. Maybe on one, it manages to block a whole script that would have done a bunch of stuff, earning a block count of 1, while on the other, the script runs but gets all of the things it tries to do blocked, leading to hundreds of block count entries.
I don't think anyone deliberately adds hundreds of trackers directly to a page. But it's plausible they have a single-digit number of moderately sketchy advertising and analytics services directly added which provide various overlapping services, each of which themselves pulls in several other tracking and analytics gadgets.
They might also have no skill or budget for proper website building tools, so they use sketchy no-code services for basic stuff like account management, accessibility, social media sharing, etc, which all insert their own tracking and analytics scripts using yet more third-party services. There's a whole ecosystem for this sort of thing that most people who would consider themselves coders never touch.
For a stock trading site specifically, they may not bother with visible ads. It's likely they have a lot of analytics for stuff like, which prompts and arrangement of controls etc makes it more likely users will actually create an account and execute a trade, what prompts for higher tiers make it more likely you'll actually upgrade, which of their own ads leads to users coming to the site, creating an account, and using it, where their users are and when they're active, that sort of thing. It's quite possible they also make extra from ad network tracking scripts, connecting your use of a stock trading site at all plus your activities there to your advertising identity for more valuable and better targeted ads elsewhere.
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