Trust wallet is even a close source wallet, even if its source code is having malware like spyware, who is going to know than the developers? Nobody. Also spyware can be able to know a lot of activities on you mobile or desktop devices. The best is to just avoid malware which will a lot be helpful. Visit only legit URL, you can have anti-malware for protection, use ad blockers and follow all ways that can protection your device from malware.
But there are massive programs where state authorities have the right to infiltrate mobile devices and laptops via other ways. I read that in Germany there was a discussion that mobile service providers were once suggested to be part of an operation where they infiltrate mobile phones with a state controlled virus at scale. They even wanted to include email providers in that program, but they protested against it and now they found another solution. Mass surveillance is not going to be a Chinese thing only.