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.