Azarael (atys)
There is a law against it since you are required by law to drive your vehicle in a (safe) manner authorized by the relevant agency in you country. You have to know this law to get a driver's license. If you do not abide by the above and are caught you can be fined, your driver's license can be revoked and you might even go to jail.Even if there is no explicit law against it ^^
I hope you are a law abiding, responsible driver :P
On the topic of 'the Contract'
6. SUBSCRIPTION AND BILLING OF OUR MMORPG
... Payment of the subscription fee enables the User to access Ryzom without limit during the subscription period and any continuation by renewal. ...
The above should have been corrected before the limit was put in place. You can ask for a charge-back and your bank will handle the case for you (do note that's it's usually a lengthy, multi-tiered process). Of course as with all contracts between parties it's usually expected that they try to reach a peaceful resolution before asking for a charge-back and/or going to court -- but it's not a requirement.