It's fair to be paid for the job you do from the moment you start it. Many airlines do that but a growing number don't.
Unfortuntely it's an employers market. It's their train set so they make the rules. If you want to play with the train set then you can either choose to go with the situation or find somewhere else.
Again, unfortunately, there are very few jobs for experienced crews let alone newbies.
Do be aware however that to pay for a TR with a guaranteed job could put you ahead of a lower paid bonded pilot in under 2 years depending obviously on who you are comparing.
You have to come in to this game with your eyes wide open. If you accept something then accept it.
Good luck