Is there a safety net to prevent users from accidentally paying absurdly high fees ?

In D13206#293450, @Fabien wrote:

Is there a safety net to prevent users from accidentally paying absurdly high fees ?

The registration frontend via cashtab uses preset fees depending on the bytes in the alias, so it does not give users the option to set the fee themselves. Technically, any dev can register via custom scripts by sending the fee and the appropriate OP_RETURN script to the payment address, but I don't think we need to hand hold those specific use cases.

In D13206#293450, @Fabien wrote:

Is there a safety net to prevent users from accidentally paying absurdly high fees ?

The 'official' front ends will create txs with specifically accurate fees. We can't stop people from creating their own txs and sending the wrong amount of money.

The ultimate safety net is the ability to review on a case by case basis and refund. If it is a common problem, we can make it automated --- but this would require a hot wallet.