Genuine answer is likely that it's not intended to be permanent. It's designed to make him look good when ultimately removed and secure some support for conservative talking points around stopping drugs and immigration across the borders.
It also distracts from the major damage they're doing internally to the government via OPM which is much more difficult to reverse.
This. I have a mobile workstation with a 12th gen i7, 32gb RAM, and NVME SSD but it's not uncommon to be waiting multiple minutes for boot due to all the pre-installed spyware from IT. It takes up half the RAM at all times and severely limits the performance for many non-whitelisted apps to the point I can't even run Firefox smoothly on it anymore.