Broadcom wasn't really a driver behind Raspberry Pi. They acquiesced and let them have chips, once the product took off, they continued supplying chips for the Pi. And of course supported the community by refusing to supply non-propriety firmware blobs to this day ;)

Other than that, Broadcom never really had any community involvement, nor any involvement in the Raspberry Pi Foundation that runs it. However, some broadcom engineers were part of the foundation, which isn't quite the same.