The spread on the TT rate has remained the same.
Foreign exchange is already a very profitable part of legitimate commercial banking and can well afford to stand any reduced profitability from the reduced (but still very large) number of tourists and expats that will be affected by this.
The increase may not seem a lot, but as there is no additional work it is effectively just additional profit - and, if it has been increased because of a reduction in tourism, one has to wonder whether it will be reduced when the tourists return
As an aside, some years ago during a troubleshooting assignment that I had, I discovered that a UK bank had quietly been increasing its foreign currency spread to a corporate client without informing them of their actions – on being informed of the underhand manner it had been conducted it was exit stage right, one corporate client.