Weird discrepancies

I was scrolling on reddit when i saw a streak shield that costs 3000 gems for ios users, a few months later, still not on android. Also the shop prices are very different between ios and android/web (android and web use the same prices).
Side note, i was promised a perfect streak reward by duo for completing a perfect streak last week. This week when i completed my perfect streak, it disappeared the day i was supposed to get it. i did do a perfect streak and didnt use any freezes or whatever