Microsoft tried that explanation before.
https://www.bbc.com/news/technology-21684329
> It introduced a Browser Choice Screen pop-up in March 2010 as part of a settlement following an earlier EU competition investigation.
> But the US company dropped the feature in a Windows 7 update in February 2011.
> Microsoft said the omission had been the result of a "technical error".
> Microsoft has been fined 561m euros ($731m; £484m) for failing to promote a range of web browsers, rather than just Internet Explorer, to users in the European Union (EU).
I would believe this explanation if that this kind of "bug" would occasionally happen in the other ways, not benefiting Microsoft.
Computer owned by my sister and unfortunately using Microsoft was hit by something similar - massive slowdowns, request to upgrade some cloud drive (leading to credit card form).
Turns out that random local files were being deleted and moved into tragically slow cloud drive, and Windows in utterly misleading way claimed that space run out and demanded money for more space.
Hard drive had over 1 800 000 GB of free space and Windows claimed that she should pay for more space.
> If you also provide a link to the filed feedback to me I’ll be happy to triage it personally as I frequently work with the teams that are responsible for update migration.
That is an intentional user-hostile behaviour, not an accident. Or at least of pattern of not really testing for bug that increase some metrics (cloud drive adoption needs to be higher? lets show misleading message that will result in it being enabled!)