Rick Neuhoff rents out his pool house on Swimply, charging $75 an hour.Courtesy of Rick NeuhoffAfter his business declined in COVID, Rick Neuhoff began renting his indoor pool out on an app.The Portland, Oregon, resident said he's making more money than driving for Doordash.He charges $75 an hour, and said he can make up to $15,000 a month in busy times.This as-told-to essay is based on a conversation with Rick Neuhoff, 65, a homeowner in Portla…