Hello!
Goa is actually the only state in India where motorcycles are a licensed form of transportations or taxis. These bike taxis in Goa are popularly known as "Pilots." You can distinguish them from other motorcycles because of their yellow mudguards and yellow plate numbers. The drivers of these bike taxis are referred to as pilots but they can only carry one passenger at a time.
You can negotiate with them for the price as well. When you hire one, you're also helping the family if the driver. From what I've read, "Pilots" are not that in-demand anymore unlike before.
Then. there's the auto rickshaw which is a three-wheeled motorcycle taxi. They can carry two to three passengers. They also have a metre but you can still bargain for the fare.
These bike taxis are great for short distances and they are cheaper than regular taxis. If you're travelling within Goa or nearby towns, then this is a great option for you.