That detente's boundaries may be somewhat vague and impossible to guarantee, but you can broad-brush paint yourself into a safer box with these four principles:

- Don't make humiliating changes to their content

- Don't mess with their userbase

- Don't leave undocumented backdoors

- Don't damage production

If you do your best to comply with those principles, then you can make a strong argument to a judge/jury that your behavior was without malice, which will notably improve your chances of survival if someone decides the usual detente isn't palatable.