Why can you sometimes transfer on TRON without paying TRX fees?
My understanding: DPoS lets token holders vote for a small number of block-producing nodes. Fewer nodes can produce blocks faster, but the trade-off is that block-producing rights are relatively concentrated.
TRON uses Delegated Proof of Stake (DPoS), with the 27 Super Representatives receiving the most votes taking turns producing blocks.
Transfers on TRON consume bandwidth, and calling smart contracts also consumes energy. Both can be obtained by staking $TRX . The current price is 0.3168.

Whether to buy is up to you; this is just a record.