I think there's a pretty big difference here. It's not like Github prevents you from building a Github competitor. Or Linear is preventing you from using it to build a Linear competitor.
This is more akin to Windows somehow preventing you from building a new OS.
Or worse yet, sabotaging vs preventing.
A surprising number of companies do include “you may not use the service we provide you to compete with us” in their terms of service.
(edit)
After a quick search the best example is Atlassian. It would (apparently, IANAL) break terms to plan a JIRA competitor using JIRA.
> Customer must not (and must not permit anyone else to): [...] (d) use the Products to develop a similar or competing product or service
Also Salesforce. Their competitors are explicitly disallowed from using any of their services for any reason.
> SFDC’s direct competitors are prohibited from accessing the Services, except with SFDC’s prior written consent.
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> This is more akin to Windows somehow preventing you from building a new OS.
Tangent, but have you tried repartitioning your Windows disk to make room for a new OS? Or tried to configure Windows to let you dualboot? Or get the clock time right if you dualboot? Or let you debug "Secure Boot"?
Windows is outright hostile when it comes to (sharing with) a new OS
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