As a big fun of Sugar Rush, Gates of Olympus and Sweet Bonanza, I can make comment for Pragmatic games in general. Especially, for last two weeks of my gambling, these three games are giving free spins very common and when I compare last 5 free spins in these three games;

For once, I hit almost x200 winnings with 0.40 Euros (almost 80 euros of winning),
For twice, I hit less than x100 winnings with 0.40 Euros,
For three times, I hit less than x40 winnings with 0.40 Euros as well,

In this scenario, most of the time these free spins are not covering a good winnings to players because hitting a free spin is also not easy in Pragmatic's games. Also, I cannot comment as these free spins are suck because they are programmed for spending more time on the games (kind of extension of game with no extra deposit). I think these free spins are programmed for earning more during play and spend these earnings as well in the same game because if I deposit 40 Euros and hit free spins while 15 Euros left, I hit a win of more or less 25 Euros in general. So, in that case I cannot move up or down as my starting balance and continue to spend these earnings on the game.