It was the present Rav Ralba”g’s father, who set up his hechsher as a business venture that was aimed at those who just wanted to keep the very baseline standard of kashrus, who accepted gelatin at one time.
I knew Rav Y.C Ralba”g AH and I don’t think he would have eaten some of the things he supervised himself. He was not even competing with the OU but looking to find ways that traditional people who kept kashrus, of whom there were many at the time, could have more choices.