The EFF explains it well in the other link. It is the Federal Rules of Civil Procedure 56. I quoted it twice. The Eastern District of Texas requires you to ask permission to file summary judgement, which the judge then can deny without explanation or reasoning. As such, while the rule says you "may move for summary judgement", this is not permitted in this court. It also says you get to hear the reason when the judge denies it. This you also do not get, as the judge will deny your ability to ask for it and the reason out of hand, and without explanation.

So we can understand that the first line of rule 56 is a lie in the eastern district of texas.

This is a very good explanation, but it might be missing one note for lay persons.

Summary judgement is cheap (well, relative to litigation, that is), fast and occurs early in the development of the lawsuit before the most expensive steps take place.

It is a direct competitor to just paying the trolls their settlement amount to stop bothering you.