The vast majority of DIY'ers buy AMD, the vast majority of prebuilds are Intel, IMO this is because Intel have a long standing and well developed relationship with pre-builders, honestly that is a significant part of it, AMD just don't have anything like as well a developed relationship with them, and while they sure as the wold is round they will improve that i don't think it will ever get to quite the level Intel have it, for one AMD are never likely to hire 20,000 sales reps to foster those relationships with all of them, they have a few who they concentrate on, shop brands like Lenovo, Asus, Minisforum ecte.... but not all of them and none of your custom builders like CyberpowerPC, OriginPC, Falcon Northwest ecte...
Intel also do everything they can to maintain a monopoly with them, they do this by heavily subsidising them with cashback incentives, heavy discounts ecte at levels AMD are not going to match, the thing is' that and hiring many thousands of sales reps is why Intel aren't turning a profit, AMD are and their reasoning is let them do that, let them spaff all their money away on this pig headedness while we make money and still grow despite Intel's efforts.