1) Not all beta applications are accepted. If you didn't get a response after a few weeks, chances are it was rejected.
2) You don't need a beta license to beta test (most) of the products. You can enable the beta or nightly update channels in most of the apps and check for updates. AdGuard for Mac requires manually downloading the beta/nightly build to use it and AG for iOS has its own beta program on TestFlight, as far as I know.