Yes, you have their PC revenue of all their games in their yearly fiscal reports, this is the FY22 one:
And this one the FY21 one (in their $300M estimate didn' know that Returnal and TLOUP1 PC weren't going to be delayed to the very end of the FY, achieved $250M instead):
They show there some early unit and revenue numbers from several games, so you can calculate the average money Sony gets per copy (after Steam cut etc).
Regarding the costs of the ports, it was
leaked in the Insomniac leaks, which are the same as other AAA ports (around 2M). Knowing the aprox. average cost of a port, and aprox. the average money they get per copy, you can know how many units on average these ports need to be profitable.
In quarterly reports they don't show the PC specific sales, they report instead since they acquired Bungie "Other software", which is 1st party game revenue (Bungie + PS Studios) outside PS (PC + rival consoles). During the first 3 FY23 quarters they performed better than in the same period of FY22. Which combined to the massive success of Helldivers 2 leads to think they'll achieve way more than the estimated $450M for FY23 regarding PC revenue.
Their ecosystem isn't losing people, it's growing instead: in the most recent quarterly report they announced last month that in December 2023 they had
the biggest active userbase they ever had, 123M MAU.
These old PC games are ported once they basically no longer sell anymore on PS after discounts and price cuts, and even have been included in PS+. So once they milked them all they could in PS.
Also, the PS5 sequel of the ported games sold better than the previous entries:
GoWR and
Spider-Man 2 broke fastest selling records for any PS exclusive release and according to one of the Insomniac leaks
HFW performed in sales the same -or slightly better- than HZD until included in PS+.
Regarding revenue and profit, they are better than they ever have been. In terms of profit they have been growing but the growth was temporally interrupted in FY21 because of the costs relalated the many acquisitions they did (they're still paying costs, which will start to ease out next FY, FY24) and also the rising hardware component and shipment costs, which skyrocketed during and after covid:
Totoki said in the QA of the most recent fiscal report that the costs from recent acquisitions will start to ease out next FY (and btw that FY or before some like Firewalk, Bungie and maybe Haven will start releaasing their first games) but since they can't do anything regarding the hardware costs they had to do some actions to improve the short term profitability specially considering the current market unstability (gaming market growth stagnated, AAA costs rising, global economical climate and NATO vs BRICS war not looking good).