A bug in btc is to have gambling machines that let you gamble 1000 times for just 1 dollarcent.
Every transaction goes down the Blockchain.
A thousand times, for 1 cent.
All the conformations....
When the Blockchain goes above the 2 tera bytes, many will drop the Blockchain.
The lowest value of a transaction must be at least 1 cent.
Better 10 cents.
1000 transactions for just 1 cent, is an attack.
All the elektra of all the conformation s ain't worth the 1 cent.
A fork should be enhanced, making it impossible to send 0.00000000001 dollarcent from and to yourself, over and over again.
When an fake gambling program is written, that could overflow the homelike hard drives,
That would be an attack, making transactions slow.
It can be done, so it will be done.
Someday.
Conformations is the problem.
No quick money, but 2 days waiting time would be a disaster for BTC.

Items are expensive.
Gambling is cheap.
Fake gambling is even less expensive.
A fault in the code that will be exploited one day.