I'm wondering how can you say they are offering bonuses with way lower wagering requirement while in fact they are offering higher wagering requirement. Are you referring to other bonuses or other requirement?
Actually, I forgot to mention the fact that these wagering requirements vary depending on multiple factors. I took advantage of a particular Intertops welcome bonus from this site where I needed to wager 6x my (deposit + bonus).
https://www.vegasbetting.com/online-betting-sites/intertopsUsed a similar strategy to take advantage of a particular bonus from Cloudbet.
OMG, it is not apple to apple comparison since the one you mentioned above is a bonus on sports betting while the bonus in Riobet is a casino game bonus. That's not a fair comparison obviously, if you want to compare the wagering requirement then you should take the same or at least similar type of bonus and type of the game.