At Somepoint I WIll Be Getting GTA VC on Steam But Am I Allowed to use a Cracked Version

Only if it’s identical to the official version (i.e. not modded).

If you don't have the decency to buy a game you're going to be putting a lot of hours into, you shouldn't be speedrunning at all.

The game is £6 G, just buy it

im us dollaz but ok im broke so ill make some money

Good luck