The crucial thing is not when the property was created, it's whether it has to do with the reason the person is being paid. Although technically, the MNs can stop funding a project for any reason, whether reasonable or not. Regardless, if the masternodes were to actually defund a project because it failed to obey a request, then they would have to deal with the consequences of that. If the project was still delivering more value than not, even though it did not obey a request, then the MNs would risk losing that value by trying to de-fund it.
This is the exact reason why numerical voting is needed.
In the currect budget system, you have only two binary choices, either fund or de-fund. These binary options cause severe conflicts, because they deal with problems as if they were black (de-fund) or white (fund). But things are often grey.
With numerical voting you have also the posibility to reduce the fund instead of de-fund. If you reduce the fund, then you may lose some value, but not all value is lost. With numerical voting MNs dont risk losing all value at once, because they can choose to reduce the fund instead of de-funding it.