I am UK player and I am not gambling for a very long time (just about 6 months). UK has very strict regulations to online gambling and actually banned most of the exciting features of online slot (bonus buy, feature buy, even auto spin and quick spin!), and we cannot gain access to sites using cryptocurrency (maybe there are some sites out there I don't know, but I don't have any investments related to crypto so just let it be)
Since it is not able to buy any bonus feature, everytime before deposit and play I have to do some intensive testing to the slot on the demo version (like testing on this site!) and I have to control the number of spins I did manually in order to decide when to stop if the slot does not pay well.
One thing makes me feel interesting is that, if you can manage to play the same slot from multiple gambling sites, do every spin at the same time, you might find some interesting behavior of the spin results and often gives you some overall profit(not guarentee). My pure guess is related to some math model behind because all online slots results are calculated by the slot provider side but not the gambling site. Or was I just hitting some nice RNG/session?