I understand your perspective but from a privacy* and cost perspective it would still be favourable for governments, companies and individuals if you run a Linux desktop instead of Windoge even if you only use it to run webapps, I think.
Plus govs / companies would have an incentive to make Linux desktop more secure / user-friendly if they'd use them instead of just giving MS money without having a say in the products.
*not even / only the "there is no malware on Linux" - which is untrue, see the recent xz thing - and would be worse if it got used more but esp from the ad-/spyware build into MS products.