Giffgaff probably feel 20gb is sufficient for most users.
@otbc11 If that were remotely true why would giffgaff even offer the always on £25 goodybag? With off peak use there is the potential to use 50GB+ of data per product.
Why too, would they give +1GB Extra to the £20 goodybag, effectively giving potentially 21 GB of data.
Many of the UK's population have work and leisure patterns that fall within midnight and 07.59 timelines and they may use their devices for data whether it be, Whatsapp, Navigation or data hungry Apps like YouTube.