Embrace. The big corporate giant dips its toe into an existing project.
Extend. The corp adds features to their app, improving on the community’s apps features. Somewhere along the line, a previously open source project will become proprietary and closed. People begin to prefer the proprietary option for the added features.
Extinguish. The proprietary app cuts out the original community (defederation) when a critical mass of users is reached. People use the proprietary app instead of the open and free app, because of the features, but also because many of the people they want to follow are now segmented from them. The original open system dies out from lack of use.
Enshittification follows.
Second steam accounts are free to create. You can’t go wrong that way