Like for Example Fortnite has Button to play with other Platforms. Yes i know that will be Bad like PC vs mobile/Console. One thing to add the PC Players with crossplay on They have Throw assist Disabled and FOV to Default VIew. (just to be Fair for non-PC platforms.
#Crossplay Option on PC
spring brook
crisp rose
removing aim assist would really not do that much as most players on steam have good aim with or without aim assist