No, they don’t say they will sue (they flat out can’t), but they say they will cut off your access to any updates.

Now one could (and I would) argue that sounds like a restriction on exercising your open source rights. However the counter argument seems to be those protections apply only to software acquired to date, and if you deny access to future binaries you can deny access to those sources.

In any event, all this subtlety around the licensing aside, it’s just a bigger hassle to use RedHat versus pretty much any other distribution, precisely because they kind of want IBM/Oracle style entitlement management where the user gets to have to do all the management work to look after their suppliers business needs.