Are you considering something being automatic and opt-out "pressuring"? Wouldn't pressuring be more if there were constant reminders...? I'm not sure many people would agree it is pressuring.
Yes, I would. Saying "you are participating unless you specifically told us you don't want to" is a form of social pressure, especially towards those whom might not want to tell all and sundry they don't want to.
I was hoping to avoid getting into this, but I'm going to cut to the quick here because I feel that it illustrates my problem in a way that is not going to be well-understood otherwise.
I am a victim of sexual violence. I deal with a variety of issues as regards this, and I have to be very careful about certain topics, especially in roleplay, because they are going to set me off. This isn't "I'm going to be uncomfortable" set me off, this is "managed with pretty heavy medication" set me off. Moreover, the things that can do this are things that, to many people, may seem innocuous and harmless. A lot of these things beyond the obvious are not things that would break the rules on this server (save perhaps the rules on harassment, if I were nonconsenting to certain roleplay and people persisted.) Many people whom have stepped on my triggers aren't people whom meant ill by it.
Part of the reason that POTM appealed to me as a roleplaying environment is because affirmative consent for most things is baked into the rules that are enforced on this server. The only person who can really closure my character is me. Situations I don't want to be in I can opt out of, unless I personally have done something to inject myself into them, or otherwise they're the consequences of my own actions. I can, whenever I want, just choose not to be involved in things that I know are going to be problematic to me as a player.
With the current status quo, I can sit on the fringes of society and pick out people with whom to roleplay I trust will not intentionally transgress those boundaries and will likely be understanding if they do. There are absolutely times I have cut myself out of roleplaying opprotunities for want of managing those personal boundaries, and there are times when those worries are likely unfounded. It's something I accept participating in these things.
Changing that status quo to it being opt in invites all manner of discomfort to myself and people that are in those kinds of situations. While it's easy to say "well just turn it off every time", the one time that you don't, and someone ends up distressed over that, to my (biased opinion) outweighs the utility of it having it be opt in.
Making an inclusive space isn't just about "allowing the most people", or "having the most people on an list"; it is having people actively and willfully participating in it, who feel comfortable and safe doing so.
It is, ironically, easy to say "its easy to just turn it off though" - but I'd invite those saying that to consider that some people just don't want to deal with that to begin with. Have some empathy for the players behind the characters too - it goes a long way. Not everything easy for you is easy for everyone else. We're all built different.
That's an entirely too long explanation of where I'm coming from I guess, but there you go.