Never heard of 'em. I'd say most of those things, while not necessarily "scams", are probably not worth the time you would put into them. That said, if you have free time and they pay, then it is what it is. If you go down that path, make sure to report back!
Big consulting firms (e.g. Accenture) and the like. Government jobs too if you're close to where those are. Outside that, it's very random which companies have such openings. The bigger the company the more likely it would have a higher diversity of roles and seniority openings.
Don't know if this counts for what you were looking for but bluetooth headphones are a game changer for me. Cleaning around the house, at the gym, on a run, etc... Very freeing compared to having the wire running into my pocket.
Relevant (to the job you're applying to) SANS course (expensive)
OSCP (for pentesting)
Any AWS cert is good if you're applying to cloud roles
But really, certs don't move the needle the way they once did imo. You may be better off documenting your experience on a website rather than just having letters. This has at least been my perspective (and I have a TON of certs so I wish they were worth more)
Never heard of 'em. I'd say most of those things, while not necessarily "scams", are probably not worth the time you would put into them. That said, if you have free time and they pay, then it is what it is. If you go down that path, make sure to report back!