You can use Minecraft Bedrock Edition with multiple accounts

I have been test and found bugs/issue that make you can duplicate Minecraft Bedrock Edition on PC with only 1 time buying

By using Email that bought Minecraft to Login on Microsoft Store

and then you can download Minecraft Launcher

and then you can run Minecraft Bedrock Edition And Login With Another Email that didn't buy Minecraft 

 

I have been test about that issue