JioHotstar has published a write-up of the engineering behind the personalised ads it serves during streaming playback: how it decides which ad to show, how it ranks demand, how it paces delivery, and how it keeps all of that fast enough to happen while video is playing.
If you own a plumbing company, a dental practice or a boutique in North Phoenix, none of this is a decision you will ever make. It gets attention because it is a rare public look at a problem most businesses never have, which is choosing between many possible answers, for millions of people, in the time it takes a video to buffer.
What it does usefully illustrate is a cost that does affect your site. Every ad or tracking system you add to a page is a request to somebody else's servers, and your page often waits on the answer. Big platforms spend enormous engineering effort shaving milliseconds off that wait because they know it costs them money. Small business sites usually inherit the same delay with none of the engineering, because a marketing pixel, a chat widget, a heatmap tool and two remarketing tags all got added over three years by different people and nobody removed any of them.
The practical version of this story is not "build ad decisioning." It is: know what third-party code is running on your site, and know why. Slow first loads on a phone lose enquiries, and third-party scripts are the most common cause I see that has nothing to do with your host or your design.
There is a second, quieter lesson. The reason a company that large can explain its own system clearly is that somebody wrote it down. If your website's moving parts (forms, booking, payment, email) exist only in one person's memory, that is a risk regardless of scale.
What to do: nothing urgent. Next time you speak to whoever maintains your site, ask for a list of the third-party scripts loading on your pages and what each one is for. Anything nobody can justify can go.
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