A one-euro deposit is a search driven by a sensible wish: to try something without risk. The problem is
that casino architecture is not built for it. Three constraints operate at once — the bonus requires a
larger deposit, withdrawal requires a larger balance, and one euro lasts a couple of minutes on
average.
The most awkward of these is the withdrawal minimum. If you stake one euro and get lucky, the resulting
sum is usually not enough to withdraw, which means the only way to get the money out is to keep playing
until the minimum is reached. That is a structure which turns a lucky start into a longer session, and
it is worth knowing beforehand rather than after.
If the aim is genuinely to try a game, a demo version does the same job for free with the same
mathematics. If the aim is to try with real money, a no-deposit bonus is a better deal than one euro.