It does fall into a gray area to emulate these games until the company who holds the copyrights re-distributes the games again so we can legally play them on current console hardware. Side note, as Sony themselves have not made any attempt to get licensing for SSX for their PS now service nor have EA attempted re-releasing the first three games in a $40 bundle. However as others have stated here it's highly questionable to link you anything here on Reddit. But i have the emulator, iso for all three games plus the bios needed to run a PS2 emulator and proper settings to keep the frame rate stable. ISO File are package files which are the original file format of games from the PS. I solved this problem by changing my emulation to perfect render but it kills the frame rate to the single digits on a 1080 gpu. The PS2 Version does hold up much better though I run into a issue in Tricky through PS2 Emulation where the snow is not properly lit by the shaders. I do say if you bumped the resolution on the GameCube to 1080p standards, you will see the compression of the graphics on your PC.
Just started playing the PS2 Version again. As a SSX fan, I had both the GameCube and PS2 Version on console.