While they may be simple to update, they are obviously only updateable when the charts are updated. ie once per year
That is true for the CAA charts (the recent mid-summer update excepted) and it may well be true for the
printed Jepp "VFR/GPS" charts we see in pilot shops, but Jepp also supply their VFR charts on a CD (called the "raster charts" product) for use in Flitestar and this CD is re-dated at least a few times a year,
AFAIK.
Whether Jepp actually incorporate any changes in these updates I don't know; informal feedback I've had is that they are very slow in doing this (years behind, on occassions). Yet, the Jepp charts are the only unified charts you can get for the rest of Europe. But potentially they might.
Since Flymap obviously license these charts from their producers, I am sure they get the Jepp charts in digital form and don't scan them in.