there were 4 transactions competing to sweep balance from
1GkGD48ucUKCwPkwRyH1bDLJTAdeHVn2xR I found two of them were trying on two different addresses with same balance of 0.5 BTC,
receiver address 17WRjamo... and
1LdUHTEV... competing on utxo of 1GkGD48u... and 152DXcBq...
I think there is more to it than just some bots sweeping some addresses
did you also find private key for
152DXcBqGShpC7mBj4XZHQG9uGY9mUtZ8d ?
btw, that receiver address 1LdUHTEV... has balance of 50 BTC

450+ tx ins without a single tx out