Gamers and hardcore gamers in particular are tech savvy so the portion of them who own jailbroken iOS devices or rooted Android devices is very high. The majority of users, particularly casual game players, I would expect the portion to be very minimal.
In particular, I frequently discuss mobile gaming on Reddit and those guys are more towards the hardcore/geek gamer market, Ads never work for them. They nearly all have AdBlockers. A lot of them also use tools for free IAPs.
It seems like you never get $ from that market.. but its not true! They fully respect a good game and will reward ethical developers by buying full paid apps or buy IAPs that they deem fair.
Ultimately if you respect the gamers, you will find many of them (enough anyway) who will reciprocate & happily pay for your content. So it's NOT about how to stop, punish or deter pirates. It's about engaging the core who value your work.
If anything, PC gaming has taught us DRMs fail utterly and only punish legit gamers.
mollaq It's not a battle Ludei will win (ie, blocking some IDs). It's extremely quick & easy to spoof a new ID. Ultimately it cannot be stopped if users are tech savvy enough to jailbreak their devices. But if you wanted to make it harder for pirates, that responsibility lies with Apple & Google, to make more protected OSes that aren't so easy to break.
Also, the "com.zeptolab.ctrbonus.superpower1" spoof or those types are the ones you know about. There are other free-IAPs method that you cannot detect, the player just gets whatever item freely with no notification. They don't even need wi-fi/net connection.