Hi,
I've seen on Telegram during last weeks around 3 old (like 10y old with no activity) wallets selling their btc.
What are the chances that these wallets are actually broken by bruteforce? I know there were discussions some years ago about people that were trying to crack the private keys.
There are lot of misconceptions here
1. Moving funds from a wallet doesn't necessarily mean they are cashing out.
2. People can do it as a safety measure to save them under new address(es).
Theoretically brute-forcing private keys is possible but the real question is how long does it takes, and with the most powerful system it will take more than a million years which means it's safe to say the funds moved by the owner or who got access to the private keys not that by means of bruteforcing.