different clouds different (free) sizes

i seem to have different clouds with vastly different (free) photo storage sizes

• box 50G
• drop 5G
• ever unlimited (1500 max pixels)
• goog unlimited (15M max file size)
• icloud (apple) 5G
• imgur unlimited
• onedrive (microsoft) 5G
• shoebox unlimited (lowres)
• yandex 250G

i only wish https://www.multcloud.com/ supported data transfer between all these clouds

refs

• https://help.everalbum.com/hc/en-us/articles/204995020-What-is-the-difference-between-high-resolution-and-full-resolution-