It's just a form of marketing for these companies - ie. a certain percentage of potential users will convert into paying users.
The reason Windows laptops have been cheaper or the same price as the linux counterpart is usually due to the combination of subsidized licensing from Microsoft, crapware installation kickbacks, and lower cost of support infrastructure (the OEM already has a huge Windows support staff and infrastructure, creating a new one for Linux - or more correctly, a specific distro of linux - costs more).
If the linux laptops sell more and more, eventually the support costs will come down to on-par (or lower perhaps... who knows). It's a chicken-and-egg problem, and one that OEM's are not willing to foot the bill up front for. We have to vote with our wallets and take that short-term hit in order to push the ecosystem in that direction.
But crapware can not pay that much. The crapware creators themselves get less revenue than licensing costs, and they can kick back just a fraction of that revenue. (That is, unless they have another business model that isn't selling licenses or spying on users.)
Even say, $1.00 per system sold with crapware pre-installed can make a difference in the profitability of a product line at scale. Then there's the kickbacks for when a customer does pay for a subscription.
Unless, of course MS is paying the OEM to install Windows, or billing for Linux computers. Or crapware has some business model that I'm not aware of.
How does that work economically? Because not everybody buys the crapware license later (and they normally cost less than Windows), and mass stealing of data is not very lucrative.