There are many ways to join a Pubg mobile tournament, and actually get money from winning. Usually though the winnings will depend on the scale and the number of participants. Pugb tournaments have also created become very popular.
In 2019 PUBG launched Global Championships. The season is divided into three phases, each of which is followed by one or more international tournaments, such as the PUBG Nations Cup.
You can search online or download esports tournament apps to find sponsored tournaments. There are a lot of big companies like Oppo sponsoring tournaments and apps like PlayerZon where you can win cash prizes for participating.
You can search for community groups on Facebook and WhatsApp groups to find tournaments. There are also websites like esptournaments.com and Toornament.