@grahamm77
Have a look at that conversation on anothe forum:
https://photoshopelementsandmore.com/thread/7311/creative-cloud-photoshop-elements-2021
This has also been discussed here in a discussion I can't find now on the present forum. There was a report of successful uninstallation.
I can't test uninstallation easily myself because I have the Creative Cloud myself for Photoshop, Bridge and Lightroom.
What I can say is that the impact of Creative Cloud in terms of disk space, RAM and processor usage is totally negligible.
I think you'll learn interesting things by reading the above conversation (includings links).
@gfmucci
Adobe does not even promote using the 'Creative Cloud', they only comment on the new features accessible with the new PSE version (saving files to share on the Cloud - 2 TB - easier sharing from mail). They don't even take advantage of the feature to explain the advantages of using the free version, like using Bridge free. They almost 'hide' the words 'Creative Cloud' because they know that would arise all sorts of 'conspiracy' theories around PSE. That's a pity, they should be clearer and perhaps change their installation program to allow not using the Crearive Cloud and accepting the lack of the new features. Anyway, uninstalling it would not give you any practical advantage. Simply don't use the above features.