I'd like to propose adding a watermark stating something like "Charts provided using Apache ECharts (incubating)" in ECharts 5.0 which is displayed as small translucent text in the bottom right corner and developers may have a way to opt out programmatically.
The reason behind this is letting more visitors to those charts know that they are made with ECharts. We recognize that many developers may not make a statement that the product is made with ECharts as the Apache license asks. Since we have so many users (200,000 downloads each week on npm), it's hard or almost impossible for us to find and check the violations. So, we could use the watermark as a way to provide a simple method to help with the branding. If some users prefer to opt out and maybe make a statement of using ECharts elsewhere in their product, they can do this easily with a simple option. What do you think? Thanks *Ovilia*
