I think its too early to make a conclusion. To some extent, many "something"-to-earn projects (e.g., play, move, dance - you name it...) have some sort of pyramid scheme which does not mean that they are not profitable if you enter / exit at the right time. LSTAR for example has made minus 9X from ATH and it could be a good point to enter (not a financial advise).
It is not early at all, if something has the characteristics of a scam then it is important to identify it early so we can avoid it.
Also I am against investing in any coin like that, now it is true that if you are early and the coin becomes extremely popular you will make some money, but can you live with yourself knowing that the money you got is in fact money that came from the pockets of someone else and that they were scammed? If you ask me I think it is better to not attract that negative karma if you can avoid it.
First, these are tokens, not coins. But here is my thoughts about karma. If you sold a "non-scam" token(or coin) at ATH and someone else bought it hoping to get more profit, but instead he/she lost money later, would you consider that you still have a good karma? Remember, not all "non-scam" tokens/coins regained their value or gained only a fraction of it because, for example, the team does not care about price anymore, they only care about project development. So you left someone with that "non-scam" tokens/coins in the wallet awaiting to get their money back but they could never get it back.
Some people call crypto a "scam" but only time can tell if a project is a complete scam. It could be that "learn-to-earn" model will turn into a complete scam. Or it could still bring some values to the community by educating people who want to learn English (or other subjects). Time will tell. Right now I would just observe these projects without recommending to invest into them/ or invest only a small portion of your portfolio, at your own risk.
Personally, I might recommend to invest only after doing a good research and my personal preference is projects focused on a good technology where the teams consistently deliver results without asking you to pay you anything upfront. I am not excluding the possibility that some of these "learn-to-earn" projects will be worth of investment, like I said, time will tell.