Since testflight will be revoking upload support for android, is there any other service that provides the same service like testflight?
Google Play Console is the direct equivalent to TestFlight for iOS, since Google Play Console is a first-party supported solution for managing beta testing of your app.
The best alternative is Visual Studio App Center, which is free. Other great apps like TestFlight are TestApp.io, TestFairy, Diawi and The Beta Family. TestFlight alternatives are mainly Mobile Device Management (MDM) Tools but may also be Error Loggers or Android Development Tools.
TestFlight supports apps for iOS, iPadOS, macOS, tvOS, watchOS, and iMessage, as well as automatic updates to ensure that testers always test the latest available build. Up to 100 apps can be tested at a time, internally or externally, and multiple builds can be tested simultaneously.
Open testing: Create an open testing release to run a test with a large group and surface your app's test version on Google Play. If you run an open test, anyone can join your testing program and submit private feedback to you.
Google play has support for beta (and alpha) testing. Check:
https://play.google.com/apps/publish -> Your App -> APK -> Beta Testing -> Manage list of testers
You have to create a google+ page or a google group. Once your beta testers join your group, you can send them an opt-in link (provided by google play when you set up beta testing)
Then they get the beta apk through google play. No need for testflight.
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