I'll save this for the future maybe we can get some infoI know this probably is a really annoying thing to post about since it has been ruled out as impossible outside of private servers but this is a question about what happened to an old hack that is probably patched right now but I figured it is worth asking.
A while ago I went to the clash royale sub and saw a post about a sketchy streamer that had his gems and gold covered and he was a lvl 10 playing in upper legendary with pretty maxed out cards. I know this sounds like bullshit and he just simply could have stockpiled the cards he wanted in one deck to maintain a low level but here is what made it different.
He had enough of each card to max all of them out. He had tons of extra of all types of cards ready to rank up and he could buy multiple super magical chests at any time. His mods would say that the reason he is not leveling up any other cards but playing in the upper legendary arena (before seasonal ranks were invented) was because he wanted to stay level 10.
After a while someone posted a private chat with a mod from this streamers chat and he admitted they were using an exploit for unlimited gems and told him the steps to do it. It was some kind of loophole but it was not shown in the screenshot. I know this post is a dumpster fire of useless information but assuming someone knows what I am talking about maybe they can help guide to a working gem exploit instead of all that scam stuff posted when you look for it.