Does stipulating a condition not to use the program in ways that displease Allah absolve one of responsibility, and does one bear sin if the service is not withdrawn from a user who openly commits sins?

The ruling on electronic programs and websites depends on the purpose of their use: if they are a means to good, then they are good, and if they are a means to evil, then they are evil.

If their use can be controlled to be limited to what is permissible, then there is no objection. However, if control is not possible, then one should consider the predominant use. If it is permissible, then it is allowed; if it is forbidden, then it is not allowed, because the ruling is based on the غالب (prevalent or predominant aspect). If the predominant use is unknown, the default is permissibility, and it suffices not to use them in ways that displease Allah.

If you know that someone is using them for forbidden matters, you must advise them and remind them of Allah. You are not permitted to terminate an existing contract with them, but it is not permissible to renew the contract for them after its expiration.