There is an online service (forgot the name) in which older english-speaking people chat online with teenagers learning english as a second language. If I recal

There is an online service (forgot the name) in which older english-speaking people chat online with teenagers learning english as a second language. If I recall correctly, it was not paid, more a volunteer exchange of company for education. So not exactly a market, but a neat idea and possible jnspiration on the topic.