1: I will never trust an exchange, most especially centralized exchanges e.g FTX Binance, etc.
Indeed, although we are using them, never trust them 100%. We have learned from some conditions so far, that although have high trust and reputation can also be crashed and then bankrupt. Moreover, centralized exchanges will also have certain interests something that will make one other competitor in whatever they want.
Indeed we use them always and they are part of our lives, only a few people who do not use exchanges but however it may be we don't trust them a hundred percent . There is no need to give anything 100% trust. Even in this forum we do not trust everything going on because you may wake tomorrow and discover that this forum is no more.
We only increase the level of trust when we are operating with an open-source protocol, which Bitcoin is among them.
2: never n trust any other coin aside from Bitcoin for long-term goals, most especially the highly centralized altcoin as there are open to external influence just like centralized exchanges are also exposed to external influence.
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Bitcoin is trusted than every other cryptocurrency in circulation and one thing about this fact is that everyone is aware of it. But those holding on to altcions are crypto gamblers. Sometimes they succeed other times dey fail and continue trying because it is the nature of the industry.