Diffractor does not sell ads or your data.
You can use Diffractor for free but if you find it useful please become a sponsor. Diffractor developers and testers are unpaid volunteers, we rely on sponsors to pay our costs. If you use it at work, get your company to become a sponsor.
Indexing and searching non-standard folders is only available to sponsors. We have to reward our friends somehow! The money is used to keep servers running, we are not buying Ferraris.