You can a bit, but the max height is still absurdly low. Where Boris bikes will probably allow a 190cm tall person to be comfortable, these probably max out around 170cm tall before you're feeling the pain.
I'm 194cm and for me it was a bit too small even when I adjust the seat. I can still ride the bicycle fairly comfortable but I need to be careful as I sometimes scratch my knees against the handlebar. I had few scratches on my right knee last week from riding Mobike so I had to adjust my technique a bit which means I cannot go as fast as I could and can't turn too rapidly left or right.
