Why do domestic internet companies use CentOS instead of Ubuntu?

have been very curious about what is the difference between Ubuntu and CentOS, school contact is Ubuntu, each time you install virtual box will be the next Ubuntu, but the company's server is installed on the CentOS, today checked the next user's wonderful answer, hehe, A brief summary of the main reasons for a few:

1, the number of resources. There are a lot of resources on CentOS, and relatively little on Ubuntu.

2, server stability. CentOS does not often update (do not know that this is not a good advantage), Ubuntu is moving to let you update, hehe, no company dares to do so?

3, technical support team. CentOS is maintained by the RH team, the technical strength of the RH team is beyond doubt, and any security loopholes will be updated in time to increase the security of the system.

4, Ubuntu is mainly desktop version, is very friendly to the individual, but for the server, with no desktop is irrelevant, occupy less resources is the key.

Why do domestic internet companies use CentOS instead of Ubuntu?