For fun, no explanation needed.

Somebody had roughly $30 bucks to burn so they used it to also spam the bitcoin blockchain with a bunch of useless and meaningless words!

https://www.bitcoinwhoswho.com/address/1JustMakeBitcoinGreatAgain161GVpC

There is no scam report and tag for this address so far but that site is helpful for you to check a suspicious address. If it is used for many scam transactions in the past, it's possibly reported and gotten a scam tag.

It can also be a great marketing for themselves as well. I used to have one like this, it was 1 and my nickname, and it was a great thing, but this person could be selling the ability to do this, so they would sell you the 1name version of addresses depending on whatever you want and charge you a fee for it as well. I suggest not using it because the private keys will be with them, even if they tell you that it won't be, assume that it will be and just use whatever you are using currently.

The problem with these type of things is that we are never sure, and if you are unsure then being on the cautious side is always better, that way you will not be scammed. The ability to make these type of things is with legacy I think, because I have never seen any segwit versions of this, some say that it is possible and there are some examples I have seen but it's so few and rare that I think it could just be coincidence as well so I am not really sure if segwit has this yet.

You cannot get private keys for these addresses, they just meet the "valid address" condition but you do not necessarily know the private key for them so you find that he deposited a small amount for that address.

This sounds like a "Vanity Address" which has a number of bruteforce-able prefix limited by your machine's specs.
On the other hand, the address in the OP is known as a "Burn Address" generated by selecting valid base58 characters and computing the correct checksum to be valid.
Unlike vanity address, it's not produced by bruteforcing address with prefix starting from a private key.

Both vanity and burn address has SegWit variant.

For vanity address, the process is similar; start fron a private key anf check if the address matched the desired prefix.
Repeat if not (bruteforce).
Use VanitySeach if you want to create one yourself.

For burn address, the characters to select are from bech32 instead of base58. Then, it's the same, compute the checksum (for bech32 address) to produce a valid SegWit address.
Now, examples of this is rare since there's no use-case for such burn address aside from "Proof-of-Burn" and the useless spam transaction example in the OP.

No one will be able to actually assess what this person is trying to do or what their reason for it.

Just take it for what it is and it’s stupid and not worth your time and attention. It’s most likely just a random thing a random person decided to do. Lots of people do things that are unexplainable and most of the time illogical.

Don’t dig too deep.