True. A lot of drugs you can perform tests on. But there is an inherent risk. I don't think making medicine at home is going to be many people's first choice. I think the people most likely to pursue this are those for whom obtaining medication other ways is not possible. When the government makes it impossible for someone to obtain health care, either due to literally making it illegal or by allowing it to become completely unaffordable for working class people, then they have to resort to other options.

With patience and diligent work it is possible to make many medications with (by comparison) significantly cheaper resources. And if someone were to do this, presumably, there are others who also have similar needs for the medications being produced. Which is how community medicine networks are formed. DIY Hormone replacement medications for trans people living in places where it's illegal for them to access medication, or otherwise extremely difficult often access medicines made through networks like that.

This isn't really a new thing, but the ease of access certainly is.