Plenty of companies use FOSS libraries,languages and tools outside the web - never to contribute anything back. And there is nothing wrong with that as long as

Plenty of companies use FOSS libraries,languages and tools outside the web - never to contribute anything back. And there is nothing wrong with that as long as the license is respected. That said many companies do contribute back and in the case of the web quite a few big libraries and frameworks were released open by private companies.