@14x Look at the history. Apollo Partners bought McGraw in 2013. In 2015, they attempted an IPO with McGraw and failed. In 2019, they attempted a merger between McGraw and Cengage. Ultimately, the Dept of Justice blocked that merger over anti trust concerns. But the proposed merger process put Cengage in Apollo's scopes. In 2021, Apollo sold McGraw to Platinum Equity. In 2023, they invested in Cengage.
The Dept of Justice may have blocked the merger over anti trust concerns, but Apollo has been in the mix for years working these two companies and this market to secure their own profits. They failed with their IPO on McGraw in 2015, attempted the merger with Cengage and failed at that, but saw that they could secure a quick buck from McGraw's sale to Platinum Equity, so they could then move on to pillage Cengage to greater profit margins.
TLDR: I wouldn't say either company has "won." Both have suffered to further the profits of private equity investors who are in this business for a payout. Platinum Equity is getting that payout with the McGraw IPO, but it remains to be seen if the company (in it's post-private equity structure) can be successful under the pressures of being publicly traded. That's not an easy thing to do, and the volatility of the market is working against them. McGraw may have a slight edge because so much of their business is in K12 (a market that cannot fully disappear so long as public education systems exist), whereas Cengage is focused more in Higher Ed (in a nation that is increasingly suspicious of value of post-secondary education). But no one is winning in this market because the market is shrinking. And an IPO now is not the answer to that issue anymore than a private equity buyout was in 2013 or 2021. As for Cengage, same troubles, different timeline, and as previously stated, slightly different primary market. As to who is winning in Higher Ed, that's Norton and Sage. Respectively, employee-owned and trust-owned organizations that answer to their markets (i.e.: instructors and students) rather than private equity investors or shareholders.