Right before the Mozilla buyout, Fakespot added a clause to their TOS giving them the right to give user data to Mozilla.
There’s one possible interpretation of that, which would be my guess, that this was somehow necessary as part of the purchase. Before purchasing a company the company being purchased has to show the buyer what their assets are and give them a fair and accurate representation of what the company is. It’s possible that this clause was necessary in order to enable this.