how can I sue Google and Apple for not letting me change my device’s MAC address (Pixel and iPhone) and internet companies for leaking my IP addresses for tracking my internet activity or to track me. Does it violate GDPR requirements?
As for tracking you and your internet activity, you can file a complaint with your local DPA to hopefully spur them into action, that's free. If they don't take action, or decide that your complaint won't convince a judge, you can contact a legal professional and pay them to take your case to court like with any other legal matter.
Also, "leaking my IP addresses" how the fuck do you expect a website to talk to you without an IP address to send the data back to.