Hi @WillemHexspoor
Security is a matter of trust.
You either trust Signal and the "experts" that audited them with your data or you don't.
Same goes for Matrix.
If you self host matrix, than you only have to trust the software.
But if you don't you'll have to trust the hosting entity as well.
With a bridge it adds another party, but if you already trusted it, it doesn't change anything.
But of course the more code you add, the more probable there is an exploit possible.
So your reasoning is not bad. But if you consider using a bridge, that's probably because your contacts are not already using matrix and are probably not interested (at least for some of them).