The developers who built these ROMs (like Android-Andi, DarkExistence, retrial ) did so for free. If this guide saved your tablet from the landfill, consider donating to the XDA developers who keep the SM-T365 alive. The source code is available on GitHub—if you are a developer, the device/samsung/matisse-common tree needs help porting Android 12 or 13.
The Samsung Galaxy Tab Active (SM-T365) is a rugged survivor in the tablet world. While its official software stopped at Android 5.1.1 (Lollipop), a dedicated community of developers has kept it breathing with custom ROMs. Sm-t365 Custom Rom