The amount of FIFA licence fee is premised on the total market size, which would be lost by cutting off Playstation market.
Even if MS was willing to pay ongoing "tax" to FIFA for purposes of cutting of Playstation, it's not clear that FIFA would go along with it,
Since it's in their interests to maximally promote their brand, they don't want to see the franchise restricted from largest part of consoles.
Consider how consoles are vast majority of FIFA market, and Playstation is vast majorituy of that console market, this doesn't make sense.
And if MS tried it, it would be easy deal for Sony to buy the licence from FIFA when it next comes available, in the mean time developing
the basis of game to implement that, with deal for Konami's PES perhaps being most plausible route for that.

I mean, this is reflected in MS' own words about "reaching larger communities", yet discussion keeps ignoring that and financial aspects,
to focus on simplistic console war mentality that only thinks in terms of total exclusivity. It's not clear why this is about consoles as such,
when it's impact on PC gaming is more clear: Why wouldn't MS favor their own game store infrastructure? That doesn't cut off customers
since anybody can access all PC gaming stores, although it would then feed into their offer with Game Pass there which is very credible.

xbox buying massive 3rd party companies won't change nothing,
they might make all the games 1 year exclusive to their console but making it a permanent exclusive will only hurt their wallets

Not if it points people to gamepass on PC or XCloud for those who don't want a series x or s.

Remember MS is not playing the console war, there are several ways to get consumer's money outside of putting games on the platform of a direct competitor.

Microsoft doesn't care about their wallet, the profits any video game makes is just icing on the cake compared to their other divisions that just print money.

If keeping some  games on XBox/Game Pass only means Game Pass/XBox gain market position and in the long term MS can exploit that market position (ie: having the Netflix of games for the next 10-20 years), that's more important to them than just hitting some sales quota for a Fallout game or something. 

Sure, that's why all the games they have announced from their recently bought studios are all coming to PS5. They just don't want to tell us yet, but Avowed, Fable, Everwild, HB2, and Sea of Thieves are all going to be announced on PS5 any minute now.

You seem to be a Nintendo fan. Don’t worry you safe we take care of our allies :)

Even if that was the case, why the fuck would anyone pay $70 for one FIFA game on Playstation when you could get it as part of Game Pass for "free". 

Ubisoft. Do it.