I used to work at Halfords, a large bike shop chain in the UK. They sold Carrera Subway bikes. There midrange hybrids. I used to dred seeing one coming back in cause they had a puncture. Especially if it was an 8 speed shimano hub and brake model. Those took ages to get the wheel out and then it was time for tyre lever carnage. Think the tyres were branded for the bike too. So they must have asked for them to be that tight on the rims.
The rims were aero box section, always think they dont have enough difference in height from the bead seat and the rim well, so theres not much slack in the tyre.
They also sold the Apollo CX10 hybrid. These were cheaper bikes and the tyres hardly stay on the rims. Guess the thing to do would be to swap the tyres from bike to bike.