If, hypothetically, they were able to close, to own, the source they were dealing with, it really wouldn't matter how much they'd invested in the previously open source. It would be just source they invested in 'cause they wanted to sell it and there would be nothing "altruistic" about it (and no benefit for any who didn't pay them).
So, no, they can't compensate for withholding information by investing in open source. They might currently be only withholding an "acceptable" amount but their investment in open source and their information-withholding can't be naively compared to see if they "balance out".
If, hypothetically, they were able to close, to own, the source they were dealing with, it really wouldn't matter how much they'd invested in the previously open source. It would be just source they invested in 'cause they wanted to sell it and there would be nothing "altruistic" about it (and no benefit for any who didn't pay them).
So, no, they can't compensate for withholding information by investing in open source. They might currently be only withholding an "acceptable" amount but their investment in open source and their information-withholding can't be naively compared to see if they "balance out".