Another route is to lobby those projects to adopt an open governance model. This effectively puts the management of the project at arm's length from the corpora

Another route is to lobby those projects to adopt an open governance model. This effectively puts the management of the project at arm's length from the corporate parent. It's a trade-off for them to get more engagement vs rescinding control. There are a number of hosting organisations that take this kind of thing on: Linux Foundation, Linaro, Eclipse.