Roma had the same punishment, appealed, was reduced but upheld. 1 transfer window for tapping up Mexes.
Reckon FIFA could argue that restriction of trade doesnt apply, or at least argue its not too excessive. They are being limited to entering a competition with existing resources only. No restriction on them actually playing football, no restriction on them selling players and making money if they deem, no restriction on advertising, sales, winnings etc. Chelsea have broken the rules laid down for entering a competition, they are still allowed to compete but with a limitation that does limit their potential to improve, but not significantly limit their operations as a football team. As a business they are not limited, as they can still transact, however just cannot enter these transactions as part of a FIFA competition.