It's not expanding the PlayStation profit margin or market share
It is a fact that they have a huge CAGR (growth) with PC revenue, that the PC ports have a huge ROI way bigger than the new games and that in recent years the PS market share and profit margin for SIE has been improving.
Totoki said the recent small decrease in profitability was due to hardware components getting more expensive overtime unlike in previous generations (something they didn't expect), costs related to recent acquisitions (something they did expect). Plus obvious things like macroeconomic stuff like going back from the covid peak + post-covid crisis and inflation + currency exchange etc.
Totoki explictly mentioned aggresive plans to improve profitability including to double down on PC, due to its ROI and growth. Which we already know its huge because ports cost a couple millions and generate dozens, which combined with Destiny gives them hundreds of millions in revenue from PC.
Being more specific, according to their public reports PS5 hardware sales are almost at all time records launch aligned. Software revenue, first party in console revenue, game sub revenue, accesories revenue, off-console 1st party revenues, console active userbase size, are in all time records and growing. They also broke per title 1st party sales launch records in 3 of the last 4 years. Looking at country specific sales rankings they are growing and Xbox+Switch are decreasing, so they apparently also are growing their console marketshare. According to Insomniac leaks, as of early last year around half of PS5s were new to PSN (who didn't have PS3/PS4/Vita).
So yes, they are expanding not only in the two points you mentioned, but basically in all their areas and breaking record gaming history records for either themselves or for almost every single SIE area or metric. They are being more successful than ever and in a growth pattern in most of these areas.
You actually said 3 billion with a straight face, huh?
Yes, Sony said many times they plan to expand to mobile and PC and that's the userbase there.
Which doesn't mean that Sony expects every single PC user in mobile gaming and PC gaming to buy their games. In the same way they don't expect every single user who buy their console to buy Sony games.
How's that "3 billion players" working out for Microsoft in growing Game Pass?
Sony's gaming strategy is completely different with the MS one. And obviously PS+ and GP are aand will be tiny parts of Sony and MS growth strategy in mobile. Only a retarded would think this.
MS growth in mobile is working great thanks to having acquired Minecraft, King and Activision Blizzard. And in the similar way, Sony plans to grow in mobile by releasing (or maybe acquiring) mobile games.
MS mentioned both publicly and in leaked mails that didn't plan to grow GP/cloud gaming on mobile, at least not in the short term.
The revenue MS will make outside their own console is what made their revenue (and pretty likely profitability too) highly grow in recent years, and in an important part from that PC+mobile revenue. It will help them grow even more releasing their 1st party games in rival console. By killing their console hardware (at least to stop being themselvs who make it) and stop selling it at a loss would improve their profitability.