> If something loses me 20M$ per year and I have an option to buy it for 10M$ or kill it for 0$, I would choose the latter without much thinking.

Weren’t the $20M reddit claimed they are losing, missed opportunity costs? I.e. if Apollo users wouldn‘t use Apollo but the official app, they would make that amount of money off of them. So buying that amount of revenue for $10M sounds definitely reasonable to me. If what reddit claims would be truthful that would be a guaranteed 100% ROI.