Some new devs decide take action into the bitcoin ecosystem and some of them are mining already have millions of Tbtc4 (even satoshi group wouldnt  do such thing), the real reason is centralize testnet . Tbtc3 will be online always, there is no possible way to shut down a blockchain with POW, many people will use Tbtc3 due huge distribution for more than a decade.

BTC is based in distribuid system with no central autorithy (no coder is the authority in BTC)
be aware of POW system that allow fix the problem of The Byzantine generals problem

the resent attack (spam, campaing etc) to testnet3 is a clear red flag in bitcoin development, but we well see  game theroy taking action in the recents events, after that, we can predict what is going to happens to BTC ecosystem in the future.

BTC was designed for a group of people we huge knowledges in cryptograpy, distribuid system, and economic laws. so is no about just to know code.

some programmners are touching the BTC code and changing it violating the balance in the system ignoring the knoledge about distribuid system and economic laws. and that is a huge concern in the futuere of BTC.

hope some of the first (expert  in (economists  and distribuid system) programmers  be aware of this.

code is easy, what is hard is the science behind BTC.