This may sound stupid but...?

[Yume]

Say the year is 2008 and you are a business that is inventing a new service that will allow users to transfer pictures from their phones to their pc and on other social media sites without the need for a usb connection cable or the need to be on the computer to do so, would you consider the usb connection cable your competitor?

[Claudia]

I would say so, at least in part, because competition is anything that overlaps what you are doing.

[Chris]

The usb is a sub competitor in this scenario not a direct competitor, the PC bluetooth device you would class as a competitor

[Richard]

A cable is not a competitor - it is an alternative technology, just as bluetooth or a printer/scanner might be an alternative technology. Competitors are people who are trying to win the customers who you want - they may offer different technologies, different pricing, different routes to market.

[Party_Time]

NO because in 2008, nobody knew about USB cables as they were not invented then. So you can't imagine something like that.
UK