I got interested and did a more apples to apples comparison:
REVENUES (2019):
Apple: $260B
Facebook: $70.7B
Microsoft: $126B
Amazon: $233B
Alphabet: $162B
TOTAL: $852B
_____________________________
GDPs in 1000's (copy paste from Wikipedia):
1 United States 21,439,453
— European Union 18,705,132
2 China 14,140,163
3 Japan 5,154,475
4 Germany 3,863,344
5 India 2,935,570
6 United Kingdom 2,743,586
7 France 2,707,074
8 Italy 1,988,636
9 Brazil 1,847,020
10 Canada 1,730,914
11 Russia 1,637,892
12 Korea, South 1,629,532
13 Spain 1,397,870
14 Australia 1,376,255
15 Mexico 1,274,175
16 Indonesia 1,111,713
17 Netherlands 902,355
18 Saudi Arabia 779,289
19 Turkey 743,708
20 Switzerland 715,360
https://en.wikipedia.org/wiki/List_of_countries_by_GDP_(nomi...