There isn't a lot of options to burn steem. As someone who provides a service burning steem as payment doesn't pay their expenses, labor, or give them any profit.

Some use cases where Steem can be burned:

• SMT token creation
• Community creation
• Promotion mixed in with trending

The first two wouldn't likely burn enough Steem to really make any difference. Three is the best hope and even that won't even remotely keep pace with inflation.