It’s not really illicit as such. In case you’re found to possess or take an interest in one of those locales, your record would be promptly ended. In Roblox’s Terms of Service, it explicitly states under the heading “Last Payment”:
“All installments for Robux are conclusive and not refundable or interchangeable, besides as needed by relevant law. You may not exchange, relegate, sell, blessing, trade, exchange, convert, rent, sublicense, lease, or disseminate Robux besides through the Service and as explicitly allowed by us. Any aura or endeavored attitude of Robux disregarding these Terms will be void and will bring about prompt end of your Account and your permit to utilize Robux. We don’t perceive or overlook any outsider administrations that might be utilized to sell, trade, move, or in any case discard Robux. We don’t accept any accountability for, and won’t uphold, such exchanges.”
You can get ended for utilizing underground market locales. The costs are such a great deal more pleasant than what Roblox themselves offer obviously, it’s unrealistic.
The cleanrobux.com cases to walk that very much worn way of free coin/thing/whatever age, as a trade-off for entering your username and a couple of different qualities like wanted coin (“Robux”) sum.
Any proposal of free Robux, enrollments, or important things is a trick. These are intended to fool you into giving out your secret phrase or individual data or make you click on an awful connection. They will likely consider and all your Robux and things.