These are called 'kickers' and are essentially just PlayOJO's term for bonuses and promotions. Other kickers may also include perks like extra bingo tickets or entries into a prize raffle.

Bonuses & Promotions 5/5
Cascading/Collapsing Reels
It¡¯s not quite BetMGM¡¯s offer since BetMGM offers $25 free, but it¡¯s close. Given the similarities in the offer, if you prefer Borgata¡¯s online casino app, that $5 difference might be worth it to choose this highly thought of brand. Borgata¡¯s offer is still strong, and given that the Borgata brand is one of the oldest and strongest in the country, you can¡¯t go wrong with selecting their promotion when it¡¯s time to sign up.
Simple registration processes
Things that matter the most while playing in an online casino?
Free Cashback
Wide range of games

mBit casino offers a 175% welcome bonus of up to 5 BTC + 300 free spins for all new casino players. You can activate the promotion with your first deposit, and it applies to the first 3 deposits.
Apart from their welcome bonuses, these platforms offer rewards to regular players. In addition, gamers can participate in periodic promotions to win fantastic prizes. Before claiming a casino bonus, some conditions to consider are the wagering requirement, eligible games, and validity period. Apart from making a qualifying deposit, you might need to use a bonus code to claim a reward on some platforms. These codes are usually specified on the promotion page. Below are some bonuses you can claim at casino sister sites:
Games
Can I trust casinos in the UK?
Pros
Finally, playing at the best sports online casino can also help you improve your skills. This is because you will be able to practice your betting strategies against other players from around the world.
The National Council on Problem Gambling reports 60-80% of high school students say they have gambled for money in the past year, making them a top priority for safeguards as the state expands access to sports betting.
Representatives for Penn Interactive, Hard Rock Digital and FanDuel raised similar concerns.