You can sell sulfur? But it's in gaseous state. It can be converted to solid? Mmmm. Fascinating. 

 SO2 is a gas and a highly corrosive gas.

S is a rock and very easy to handle.

Of course, burning sulfur you get the corrosive gas again. 

 I hear the smell is not spectacular. 

 It has a sharp smell. The foul-egg-smell is H2S, which volcanoes also spit out. 

 Failure to appease the volcano God never went well... 

 tldr: you would need to hire a lot of lawyers, pay a lot of money (above and under the table), deal with a lot of environmental activists, and the whole !# 

LLM: The Taal Volcano Protected Landscape (TVPL) covers the entire Taal Lake, Taal Volcano Island, and the surrounding areas, amounting to approximately 62,292 hectares. This protected status means that the area is subject to regulations that aim to conserve its biodiversity, protect the environment, and manage sustainable development. Activities in the area, including potential resource extraction, are regulated to ensure that they do not harm the environment or disrupt the ecological balance.

Given this protected status, any industrial activities, such as large-scale sulfur extraction, would require thorough environmental impact assessments and would need to comply with strict regulations and conservation guidelines. The focus in such protected landscapes is typically on preserving the natural environment, which could complicate or limit industrial operations like sulfur capture. 

 Well, the amounts sounded just silly but I imagined something like 🌋 with a stream of SO2 coming out at the tip. If the SO2 leaks from a 234 square km lake, that's ... obviously not a very dense stream of SO2. But when it comes to environmental protection, the idea was precisely to protect the environment by capturing the leaking poisonous gas.