I have answered in the Telegram channels multiple times that is does not work correctly on mobiles, even if you set it up in desktop mode (and obviously is not recommended as you can easily damage your phone because of the heat). At least not for mining, for sending coins yes, you can do that with high degree of success.
The Androind app was not updated and that is no secret. There is a sort of monitoring app introduced that works OK though.

What would be nice is an updated Android App for staking. (as mining POW from the phone is purely an exercise, it makes no sense taking into account the difficulty on the network) But there are limited dev resources so if there are people from the community who would be interested into helping coding this part they will definitely be rewarded fairly in WEDB.

Anyway, I think the devs should also answer some of your questions in their own words as I am only speaking in my name alone.

You are funny. With the current hashrate on the chain you can't compete without terminal mining. It's simple math.  You could have done this if you were here an year ago at the main-net launch.

Even BTC was designed to be mined initially with CPUs, but that did not last long when people saw the incentive and started finding our more competitive ways of mining it. It is an open source project and anyone can code a better miner. So that is why the Terminal CPP miner is 10X faster that the browser. You can't stop that, you need to adapt.

This is also one of the reasons that staking was introduced (among many other). Staking (POS) is now the easy mining alternative of WEBD.
Just buy coins and stake (or wait for the bounty program and win through tasks), POW became more complicated because of the competition and evolution in time.

No one has a magic wand to limit the number of miners and amount of servers they dedicate so that you can profitably mine yourself with a simple PC in browser.

Yes there might be some bugs that you come across but as the team is rather small it does take time for them to fix everything and also create new features like cold staking which is coming next.

For terminal there is this tutorial that works 100%: https://github.com/cbusuioceanu/How-to-mine-WebDollar-with-Linux-Terminal/blob/master/how-to-mine-webd-linux-terminal.md
Everything is integrated in scripts and does the install for you. You must be too noob or ill intended to say it does not work.

Bounty system is almost coded and the distribution of coins will start soon. Everything will be included in automated rewarding system, if you do a tasks you will receive the reward.

This coin is now oriented more towards staking as mining is done with data-centers, that is why if you want to invest it is easier on that side, but obviously it it your choice and you do your own analysis.