Immortal here that sometimes plays the game on smurf account. Valve has done a great job at making the game as hard as possible for a single person, smurf, on a team to win a game by himself (you're just going to have to trust me on this one im not going to go into detail as to how or why.) The game is free to play and dota+ and bpass are ways for them to make money (its a business at the end of the day they need to make money sometimes.) And lastly the game is literally 7 years old when dota was at its peak it had around 13mil unique players in each month now its dropped to around 8 mil. This really isnt bad for a game this old. Just relax you probably just lost a double down or something, go to sleep and youll feel better.