No. Any offer of free Robux, memberships, or valuable items is a scam. These are meant to trick you into giving out your password or personal information, or make you click on a bad link. Their goal is to take your account and all your Robux and items.
Never enter your password anywhere other than the Roblox login page
Never share your password or sensitive information with another user
Don't click on suspicious offsite links
Here is a list of true ways to get Robux.
What should I do if I see scams?
Report messages, links, and experiences right away by using the Report Abuse links and buttons located around the apps and in every experience menu. Our moderators will be able to take correct action against people trying to scam your account. You will also be helping to make Roblox an even better place!
You can adjust your Settings to prevent others from sending these sorts of messages by selecting Privacy and choose who is allowed to send you messages, chats, and more.