In Cambodia, 120Gb (per week) of download cost me US$1 (per week) over good-quality 4G connections anywhere in the city (but almost nothing outside the cities). In Berlin, it's 40 euros a month for 5Gb, and coverage is a bit patchy, and very patchy if I go a few Km's out of the city.
In Bali, a $5 SIM card got me a month of effectively-unlimited download over decent connections. Nepal, Malaysia, all good. Phillipines was tricky to get decent coverage, but when it was there it was cheap.
Cafes in SE Asia offer free wifi with a coffee. Berlin nope.
I get the price differences are a function of relative GDP. But the performance differences should be the other way around. Tech should work better in developed countries, not worse.