Perhaps.
Its a big threat to caps to be awoxed in this way.
But yeah, its legal, as long as they are doing it with 2 subbed accounts, or just one Alpha/Omega at a time.
Hell, its frankly easier/cheaper just to infiltrate in an alpha, spy, share information to hunters and then point the victim at an opportune moment when the hunters are prepared. You don’t need two accounts to do this, and its cheaper with just one free one.
I think its unlikely that in OPs situation, its an illegal multiboxer.
And as to abandoning that account with the alpha afterwards, thats legal too.
Just make a new account, create alpha toon, and rinse-repeat.