Did you read this also?

What can Stellar do to prevent this?
I think there are a few possibilities.
- There could be a significant delay (perhaps 24 hours) before giving the reward. This would prevent people from paying for a transaction that only takes 3-minutes in total.
- Stellar could pause the rewards altogether and distribute it a little slower.
Stellar has changed the way to distribute them, and it is using both things right now.
So even alt-coin devs can do the same.