Go for it ! You might find people on places like Upwork, but there's always the risk that they'll keep a copy of the work and use it to make money for themselves.

Moving on beyond mobile games, the budgets can spiral insanely; many Playstation or XBox games nowadays have budgets comparable to a Hollywood blockbuster, and are produced by studios with dozens or hundreds of people working for them (although I suspect some are just there to make coffee....).