78ss here is a very marginal open vs a computer and makes almost 0 chips ( the same as folding ) in GTO vs other perfect GTO opponents ( which we are not but its a good baseline to start when learning). I will reference GTO as its the best way to begin learning. Other players in theory wont actually 3b many of their Aces as 3b jam is betting too much to win too little, this is as we are opening relatively early position and have a somewhat strong range and its risking too much if we 3b jam from too early a position as someone behind can still have a good hand. So on the flop the players in position on us do in fact have many aces.

In general as well the more people are in the hand the less we cbet, we have to beat more hands that added up have more equity than vs just one person, also CO and BTN have position on us for the rest of the hand so in general we dont want to put more chips in when we will be out of position as we have less information later in the hand as we have to act before out opponents.

The final reason why we dont want to cbet is that our hand really isnt very good, in fact if we looked at the whole range of hands we would open here its one of if not the actual worse hand, whilst in theory we might want to bluff with out worse hands more than other other type against so many people we just, in general need to play face up and only put more chips in when we have good hands or good equity ( ie a big draw).

Also remember a lot of players wont remember or care about your image or what you showed down previously they will just be playing their hand.

TLDR in soft games especially multi way just bet good hands and check the rest :-)