Description: Server could sell barrier block for use as deco (prevent vines growth, etc)
Why: Using string have its disadvantages like visible at certain distance, unintentionally broken without notice, etc
How: Staff could sell barrier blocks for example for 1k (or even 10k) each with condition its use is for decoration only without hampering player movement/other use beside decorations, placement with 1 block distance gap between barrier blocks, etc.
Pros:
First point: increase decoration options for builders
Second point: more money sink for the economy
Cons:
First: reduce market cost for strings (people will prefer barrier blocks, but this will depend on barrier price)
Second point: might hinder some structure building (for player) and needing staff to remove, also more work for staff