Twitter is a public company owned by shareholders, running a private service on their own servers. They have a right to try and control how their service is use

Twitter is a public company owned by shareholders, running a private service on their own servers. They have a right to try and control how their service is used by users and developers. If Twitter tells me I can't access their API, I probably won't develop that client not because I technically cant but because it would be an uphill battle to develop and put something out there if it depends on someones third party servers and that person does not want me to use said servers.