Short answer. Yes and Maybe. Yes to your first answer on USB miners that can mine altcoin. However profitable all depends on what you are calling a profit. $1 a month well would be consider a profit compared to $0. You won't make any big $$ off usb miners. However for a hobby miner they are neat.
I have 3 different types currently running. I have 2 futurebit moonlander 2's mining Digibyte at 720Mhz and netting just over 8Mh/s combined. That's about 3 cents a day ($0.03). Futurebit has the Apollo that 2nd batch is currently being worked on and slated for end of June I think? Some have reported up to 100Mh/s to 120Mh/s using the new Apollo on Scrypt algo. At 100MH/s that would net you about $0.42 a day at current values (As of 5/16/19).
I have 4 GekkoScience newpac's running at 400Mhz and getting 90Gh/s each, 361Gh/s combined total. This if I was looking at profits would net me $0.12 a day. So between this and the moonlanders that would net me 15 cents a day
However I'm not looking for profits and the power they are using doesn't affect my electric (low to no cost for me). I have the gekko's aimed at Litecoin Cash and getting about 10 coins every 24 hours.
And lastly I have 2 of the new Gekkoscience R606 pods. They are getting ~ 1 Th/s each on volt setting 5 (7 total settings) and uses about 48 watts per pod. Not bad.
2 Th/s would net me $0.65 a day. If I was looking to make a profit with all of these added up would be $0.80 a day. And since I don't pay electric about $24.00 a month.
However like the others, I'm not looking for a immediate profit. I did have these pods mining Litecoin Cash and was getting about 56 coins daily. However tonight I've pointed them to solo mine Digibyte.
Most people use these pods and newpac's as a bitcoin lottery machine so to speak. I however mine altcoins with them.
Also these R606 are quiet! They are no louder than a Desktop PC rear exhaust fan. My moonlander fan's are louder lol. Which this makes the wife happy as me having a full fledge ASIC miner in our house is highly frowned on lol. I don't have a garage or a storage area offsite to set them up as of yet. So for me, this is a low cost start.
And the Apollo's are next on my list.
<---- The newpac's and moonlanders
<---- The R606's. They were just restarted on DGB solo mining so haven't averaged out at time of posting. After a few hours these should level out at 1.817 Th/s.