Not wanting to shill for glocalme but let me explain why gigabytes is a poor measurement. When I travel what I need is access, the traffic I generate is ridiculously little: email, maps, messages. Heck, a VoIP call consumes like 8 kbytes per second so a call with my airbnb host "hey I am outside! great, I am coming" won't exactly bankrupt me I usually do EU wide visits for roughly a month and glocalme covers that for 16 EUR meaning my access is ~0.6 USD per day. Totally works for me.

If what pokefi promises is true then yes it's even cheaper because their 15 USD 5GB data theoretically expires in two years and if I have say 60-100 travel days then yeah, that is very cheap but it requires them to be actually available in the countries I am and to be alive in two years. With these companies who knows? I need to trust glocalme for 30 days ahead, tops.