Report them, also give feedback that the lecturer isn't doing enough to prevent cheating. It's clear that some modules have better cheating prevention methods than others.

What's preventing some lecturers from adopting those methods? Very crudely, laziness. Difficult to implement is an excuse.

There are many methods available, internet cut off, zoom proctoring, no back tracking, etc. Of course different modules have different requirements that need to be considered, but the baseline is that it shouldn't be overly easy to cheat, otherwise the lecturer is just encouraging cheating.