Monero is triple encrypted. You crack one and you got no time left before the next chain flips the whole shebang.
If monero is using sane, modern encryption algorithms, “triple encryption” doesn’t really get you meaningfully more security.
It already takes an insane amount of time to brute force good encryption algorithms, so if people are cracking your encryption, they’re doing it via some vulnerability/flaw/exploit in the algorithm which allows then to crack things much faster than brute forcing. If you use the same encryption algorithm for all three layers, you just have to exploit it three times instead of one, which isn’t really adding any difficulty to a competent attacker.
What if you use three different encryption algorithms, you may ask? Well, that’s even worse because you’ve now tripled the attack surface of your encryption scheme.