The whole point of RAM is to be completely used.
RAM exists because storage is slower.
Computer designs have long been a hierarchy of higher cost parts and and higher performance, and blending lower performance and lower costs. Processor memory cache is Really Expensive memory, but is Really Fast memory. Main memory (RAM) is expensive, and fast. SSD is less expensive, and is slower. Hard disks are cheap and capacious and really slow. Tape storage (rare with Mac, but more common in some other computing environments), yet slower, but cheaper.
If you have free RAM, you either have too much RAM for your load, or you’re not using what you have for best effect.
Efforts of add-on apps to try to “free”RAM are trying to release RAM that macOS thinks it can use for apps and data caching.
Free RAM is wasted RAM.
As for other Macs with other issues? With the millions being sold per quarter per press reports, you will be able to find some Macs showing pretty much any misbehavior you want to find. With millions in use, you’re going to get matches.
As for M1, how that is designed is somewhat different than how previous Macs were organized, as the memory is (performance-wise) located closer to the processor, and is faster, and the main SSD storage itself is running at what were commodity RAM speeds from not that long ago.
Here? Remove the cleaning app, and remove the anti-malware.