It is wiser to trade convenience for security and privacy if you want them.
Less popular apps have the drawback of not having their source codes audited. While there are several significant indicators that make it appear to be safe in terms of privacy, their business strategy isn't dependent on advertisements and they prefer to generate money by selling it off directly. In addition, you may analyze applications' background network activity for any unusual connections.
In the end, the best suggestion I can give you is to entirely disable the application's network access in the settings if it's capabilities don't appear to require internet connectivity.
Olauncher, the best launcher in its class, is what I personally use.
If you wish to use your phone, have a look at it and adhere to it.
Happy day to you.