How can the Firewalk, Haven and Deviation games be "safe bets"?
With Bungie and Naughty Dog we at least know they can make successful IPs and good multiplayer games or modes. With Firewalk, Haven and Deviation we know absolutely nothing. We haven't seen anything. All we know is that they're working on live service games. That's it. So there is still a big ? hovering over Haven and Firewalk. Let's see the games first.
We know they have many key devs who worked in many top performing shooters of the relatively recent years and/or in the fastest selling AAA new IPs and GaaS shooters ever.
So if Sony had to sign 2nd party AAA new IPs, or GaaS shooters, they were the best candidates. It's very difficult, maybe impossible, to find someone with a better CVs than them. Each one of these studios have a good number of people who had a key role in many top AAA titles, specially in top ones of these areas.
Is MLB and GT making them much money ”Gaas” wise?
Their GaaS are the most successful ever games in their series. Sony now also gets tons of money from Destiny 2 or their mobile game Fate/Grand Order, both GaaS too.
I'm sure there are some internal unannounced projects at PS Studios that got canceled too. It happens. This isn't something new. It happened before Sony's live service plans and it will continue to happen
Yes, it happened in basically all companies since the '70s, nothing new. When a game doesn't achieve enough level of quality to the point they can't improve it enough in a reasonable time and budget or if they see that the market changed too much during development, gets axed.
An example in 1980 there was a game for arcade machines that was going to be the first game fully designed and developed in Spain ("El Paracaidista"), but got cancelled because the game was in black & white and that year the arcade games in color appeared and super quickly dominated the market. They saw it was going to fail hard, so canned it and started to make a game in color. Another game for arcade games, in color became months later the first Spanish videogame ("Destroyer").
There are also tons of other games that now are known that were canned in the '80s (or any other decade) for arcade, microcomputers or consoles.