They aren't really full on game subscriptions, gold and regular ps plus don't qualify. A tiny selection of games each month does not make. The fact is, in terms of full on game subs, gamepass has a lot more subs.
By definition game subscriptions are subscriptions that give you games, so Gold and Essential qualify. That's a fact.
GP doesn't have more more subs, PS+ around has twice as much as GP, that's another fact.
Even if you insist on adding both ps plus and gold to the pile, the numbers are similar as total revenue. Which is impressive considering ms has less than half the hardware units to sell to. The numbers I'm seeing online us 4 billion for ms per year, and similar for Sony. (Just under a billion per quarter) Your previous statement appears to be incorrect.
SIE's Network Services make that around just under a billion per quarter you mention. As of now that's basically the revenue of PS+ plus.
Microsoft can't make this money with half the subs at all. Even more considering a lot of them people with free trials, $1 trials etc. You may have seen some "Xbox content and services revenue" number somewhere, but that number also includes the game sales and DLCs sold for Xbox, isn't only their services.
"Xbox content and services revenue" is somewhat equivalent instead to the addition of Sony's G&NS "Digital Software and Add-on Content" and G&NS "Network Services" revenues combined (around $3.32B last quarter, $13.5B last fiscal year). We have to consider that in Sony's case this is only for PS software, they also have a separate group for PS hardware and another grou for "other" (which includes PS accesories or PC revenue).