Seriously guys, how do you deal when remotely collaborating with lets say not the most motivated and competent devs?

Our scrum team got formed about 6 months ago from leftover devs of other teams, choosing a couple competent devs at the core and other devs who were kinda gotten rid of by their old teams, and after 6 months of working together I can see why.

Situation is that we are 7 devs in our team and 4 of devs are not pulling their weight. They are seniors on paper, but in reality not really.

They rarely take something complex to work on and even if they do, they make sure they take as much time as possible. Two of them are contractors who I imagine decided to treat the job as a paycheck and nothing more. There is no initiative, no push to make things better and in general attitude is to do bare minimum: only what is being asked and then delaying the hell out of tasks.

Im not exaggareting: Im talking about every possible way of dragging out the tasks: delaying communication, sitting around for a few days while not asking for new tasks to work on if they are blocked, also avoiding standups. Working for days on very basic comments in their MR's. Getting "sick" for a couple days on deadline when things get tough, so that someone else would come in, refactor and save the day. Once or twice it could be a coincidence, but nowadays I can already guess ahead of time what kind of trick they will pull now.

Our project is an android app where we have to support few different tablets, so the most recent new trick that I witnessed is devs avoiding hardware delivers, sometimes for months. Idea seems to be if you dont ping your team that you dont have hardware, then you can avoid working on related tasks with that hardware.

Worst part is that they get away with it. Our teamlead is a senior dev who is first time teamlead, doesnt code anymore and doesnt want to rock the boat. He is the type of teamlead who sets arbitrary deadlines, makes it sound that they are urgent and takes a few days off in the middle of chaos just before deadline. Restrospectives don't help at all and if I try to bring up stuff directly to him he tells me to bring it up during retrospectives. We discuss issues, rant a bit ant then continue carying on like nothing happened and nothing changes.

So little by little in the past 6 months we came to this point where 2-3 devs are carrying the weight of the team and are in a constant crunch mode, while others are allowed to slack. Its becoming ridiculous.

Problem is that this is starting to affect our morale. Only way that is left to keep my sanity right now is to pull away sometimes and also slack. Then I come back at full capacity, give my best for a couple weeks until I have to go and fix some basic leftover task that has been purposefully dragged out for 2 months and left unfinished, then I just want to scream and I know that its time to disconnect again.