If someone be able to predict your phrase than it can be easily hacked.
People can't simply predict your seed/recovery phrase. For 12 words length, there are 2048^12/16 possible
combination permutation.
In Trust wallet's case, we don't know that the seed phrases it generates are picked at random out of the 2048^12/16 possible permutations.
As it's closed source, it's definitely possible that they create them deterministically and will either steal small amounts of funds (such that it goes unnoticed for as long as possible) or do a big giant rug pull in the future, emptying all of the wallets.