I've been following the coin since it was sold on Binance Launchpad, a commendable project, all doing on their roadmap, the price is still low for a coin like MATIC.
I agree with you, Ethereum network is congested then it urgently needs a layer 2 solution and Polygon seems to be the more promising solution currently. Even FUN token while be brought on this layer 2 network.
That is correct until they figure out a way to fix the congestion. I get that right now it looks like it has been over a year and it also happened in the past as well, so we keep having the same problem and we haven't seen a fix. This resulted with other projects providing an alternative solutions, we have ones like Matic that offer Layer 2, in that case you end up with dealing a lot better and quicker and pay a lot less if you are an avid user of ETH products, we also ended up with other stuff like SOL that offers much faster transactions and bigger TPS.
All of these are valid until ETH finds a way to drop the congestion and make it cheap again, I do not know how they could do it, but I know that if they ever find a way to fix it, and get the gas fees lower again then in that situation all of these "solutions" would be for nothing and will drop. That is my biggest scare for these coins.