It is because of higher demand by small investors and the Gas prices keep climbing higher. There are several reasons to hold Eth and small Erc20 tokens that to sell on altcoin boom but fees make it impossible to get an profit.
That's why I feel that decentralized exchanges are always at a disadvantage as compared to centralized ones. There are no such issues and then there are problems of front running bots in the decentralized exchanges which is near impossible to get rid off.
would it not have something to do with all the people buying will shiba inu coin and fees being pushed up to cash in on it ?
That isn't the reason, I am sure. Yes shiba inu has been pushed pretty hard by the community and their owners but there are lots of other tokens as well which are being traded all the time and them along with others is what's causing the price up.