The problem with Language Transfer is its very limited language selection and its format.
Duolingo allows reading, writing, listening and speech (last two can be disabled if unsuitable in your context), and it does not impose daily limits. I’ve yet to find an alternative app that does all 5 of those things.
Some Chromium browsers like Brave and Vivaldi already announced they’ll extend it for as long as they can, and when they no longer can’t, they’ll think of something else like improve their own blockers.