It forbids denying me service as punishment for not consenting to your data collection. You can totally make your public server private though. Configure it so that it only responds to certain computers, then invite people or charge them for access. If you do it like this, the only way people can talk to your server is if you allow them to. They won't be strangers and will have your consent.

You still need their permission to collect data and you can't revoke their access as punishment for refusing.