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You would be surprises on how many people will claim this and also find a way to abuse it. This may be a very small amount, for some people this is already a nice amount where they can something with it. If there are no requirements on the claiming, you can be 100% sure, that people will abuse it.
On a side note, anybody actively playing on the site and can recommend it? Looking for some other casinos to play at.
If there are people who try to abuse, I'm wondering what kind of people they are who want to spend their time for $5 in a month. Even if people try to abuse it with multiple accounts, I dont think it will be worth their time too unless they can create a bot that can claim the free cent automatically and can be implemented with multiple accounts. Lets say they can create such bot, I'm sure the security system in the casino will detect it and all the accounts will be banned.