We were approached to partner with an accessibility company that has their own overlay, we said no. Coincidentally, we saw this tweet by @ScopicEngineer the same day we declined the partnership.
Accessibility overlays come with a host of problems, including overriding a user’s customization settings; they do not reliably work, and often create more harm. Instead, accessibility needs to be considered at every stage of a project and baked into the code from the get-go.
If the “easy fix” is too good to be true, it usually is.