Spending money on a team doesn't equal to winning a title, that's not how it works. If you are in a league like France, then yeah it may work because PSG is the only one who can spend as much money as PSG does, and there is no opponent ,but this year even Brighton spent more than United, so its clear that spending money isn't a win at premier league.
Spending money wisely wins you the league but most clubs aren't spending money wisely. Manchester United used money to win the league when they did in the past that no other clubs were able to compete with them. Chelsea came into the picture and did the same thing and won trophies after trophies. The next was Manchester city and they're still doing it and winning the premier league back to back. For Arsenal to be even competing with Manchester city for the title, they had to spend money wisely by acquiring players. You can't win without spending money. The reason teams like Brighton has been performing so well this season is as they spent money to buy players.