Probably Silva had known that he won't win no matter how good his performance is since the judge will definitely favor Paul. As a result Paul indeed won via unanimous decision but it was labeled controversial by some sports site since they had it scored in favor of Silva with Paul only taking 2 rounds (including the 8th round knock out) You can read more about the unofficial scoring of that site in this
postEvery time any of the Paul brothers will have a match, most of those matches are favorable to them. We don't know if that's part of the contract or script that has been made.
But with money that they're including to it for those fighters to agree on their matches, they're paid well and this match is nothing to them but just a free lunch and quick part time job.